The Google Nexus 7updated

What you should know: 
The tablet has a 7-inch, 1,280-by-800 Gorilla Glass screen and a slightly grippy, stippled black rubber back panel. At 7.8 by 4.7 by 0.4 inches (HWD) and 12 ounces, it's comfortable to hold in one hand for long periods. Unlike the Apple iPad mini, it's easy to get your hand around the Nexus 7, and the textured back prevents you from dropping it. The Power and Volume buttons on the right are nicely designed, easy to find and not loose.
This Nexus 7 looks just like the earlier Nexus 7, except for one tiny change: A MicroSIM slot tucked into the left side. Use a paperclip or similar tool to pop it out, and you can slip your SIM card in; our tablet auto-configured itself for both AT&T and T-Mobile.
The Nexus 7's IPS LCD screen is decent, but it's been outpaced by Amazon and Barnes & Noble.

What it offers: 
The Nexus 7 is the best small tablet on the market, but we'd rather tether it to a 4G smartphone than use the built-in modem here.
The advantage: 
Plenty of storage. Solid performance. Latest version of Android. Inexpensive, for a cellular tablet.
The unfavorable: 
Cellular speeds are more 3G than 4G. Only compatible with AT&T and T-Mobile.

The price:
$ 249.00

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The Amazon Kindle Fire HD 8.9"

What you should know: 
The Kindle Fire HD 8.9 is available in several models. Without cellular, the 16GB model costs $299 and the 32GB model costs $369. With cellular, a 32GB model costs $499 and a 64GB unit costs $599.
At 9.45 by 6.50 by .35 inches (HWD) and 1.29 pounds, it's smaller and slightly lighter than the Nexus 10, the iPad, and other 10-inch tablets, which makes sense; after all, its screen is a bit smaller. Like most larger tablets, it naturally orients itself in landscape mode, with the 1-megapixel camera at the top and the power and HDMI ports at the bottom. The headphone jack and very flat Power and Volume buttons are on the right side. The back panel is covered in a soft-touch material, which feels great, but shows fingerprints. There's also a shiny black stripe running the width of the tablet. The stereo speakers show at either end of this strip.
The 8.9-inch screen is a good-looking 1,920-by-1,200 IPS LCD panel with relatively deep colors. It's outmatched by the competition; the Nexus 10, iPad 4, and even the Barnes & Noble Nook HD+ all have even tighter screens that pop more.
AT&T 4G LTE performance on this tablet was solid, with download speeds averaging about 13.5Mbps and uploads clocking in around 6Mbps. The tablet really benefits from the dual-band 2.4GHz/5GHz 802.11n Wi-Fi. While connected to a fast corporate network on the crowded 2.4Ghz band, the Fire averaged 11Mbps down, but kicked up to 31Mbps when switched over to the 5GHz band. That means you can transfer a 1.4GB movie in six minutes as opposed to 16.

What it offers: 
The 8.9-inch Amazon Kindle Fire HD is the top low-cost large-screen tablet you can buy, but to get the best bang for your buck, go for the Wi-Fi-only version.

The advantage: 
Very easy to use. Least expensive tablet data plan available. Amazon Prime members get lots of video and book content. Multi-user parental controls.

The unfavorable: 
Other tablets have more apps. Speed is just okay, not great. User interface is very shopping-oriented.

The price:
$ 499.00
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The Magnet of Google's Nexus 7

Do you figure out how Google's Nexus 7 make money? As of today it continue to magnet buyer, as it sells less than million tablets each month.

The $199 starting price on Google’s (GOOG) Nexus 7 was widely expected to bolster sales, but no one could really project how the affordable Jelly Bean tablet would be received considering the tablet’s relatively limited distribution and the mass market’s all-around indifference when it comes to most Android tablets. According to Asus chief financial officer David Chang, however, Nexus 7 sales have grown significantly and now total nearly 1 million units each month. “At the beginning, it was, for instance, 500K units a month, then maybe 600, 700K,” Chang told The Wall Street Journal in an interview. “This latest month, it was close to one million.” The figure doesn't approach iPad sales, which are in excess of 1 million units each week, but they are impressive nonetheless considering how much wider iPad distribution is and how much Apple (AAPL) spends promoting it compared to the Nexus 7.

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The Sony Vaio Tap 20

The advantage: 

By slapping a battery inside a 20-inch touch-screen all-in-one to make the Sony Vaio Tap 20, the company has given birth to a new PC category with great potential in tech-savvy homes.
The unfavorable: 

The touch screen has some frustrating drag, and Sony made a few missteps among some otherwise reasonable sacrifices for portability and price.
The offer: 

A compelling experiment in tablet-desktop hybridization, the Sony Vaio Tap 20 is a great fit for home tech enthusiasts willing to try something new.

The Tap 20 measures 19.75 inches wide, 12.13 inches high, and, at the thickest point of its tapered back panel, 1.5 inches deep. It weighs just under 11.25 pounds.

The 20-inch display makes sense as a way to keep the Tap 20's size and weight down, and in order to manage heat and battery life, Sony chose an ultralow-voltage 1.7GHz Intel Core i5 mobile CPU. The absence of an optical drive is conspicuous, but likely helps keep the Tap 20's thickness in check, and it's not out of keeping with other Windows 8 PCs.

The Lenovo IdeaTab A2109

This device has rounded corners, tapered edges, and a silver-grayish plastic build. Though I am a fan of the smooth brushed-chrome finish (which gives it a more luxurious feel), the whole design is reminiscent of the first-generation iPad. The A2109 is bulky, which doesn't make it great for butterfingers. The backplate’s slick surface, in combination with the device's thick profile, prove to be slippery and unwieldy.

The advantage: 

The Lenovo IdeaTab A2109 sports a snappy quad-core CPU, features expandable storage and an HDMI output, and is reasonably priced at $300.
The unfavorable: 

The IdeaTab A2109's display is unimpressive, it has a bulky build, and it has disappointing video recording quality.
The offer: 

Despite having a decent price tag and zippy processor, the Lenovo IdeaTab A2109's screen is just too drab to consider.

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The Asus Vivo Tab RT

Take a look at this new tablet and its features..
The VivoTab RT has a 10.1-inch, 1,366x768-pixel Super IPS display and is powered by an Nvidia Tegra 3 TE quad-core processor, along with 2GB of RAM and 32GB of storage. Microsoft Office Home and Student 2013 RT Preview Edition come included (but note that should be the case with every RT machine).
An 8-megapixel rear camera, 2-megapixel front camera, and built-in NFC round out the Vivo Tab RT's feature set.

If you prefer that full version of Windows 8, note that a step-up version of the Vivo Tab running the grown-up version of Microsoft's OS is also planned. That model will be powered by the next-gen version of Intel's Atom CPU.
It's unclear if the Vivo Tab RT will be available on any other carriers in the U.S., or if it will be coming in a Wi-Fi-only version at some point. Also unknown is the price and exact release date of the AT&T version.

The Lenovo IdeaTab S2110A

The Lenovo IdeaTab S2110A offers an impressively bright screen with wide viewing angles, fast gaming performance, dual cameras, Micro-HDMI, and a useful keyboard/dock option.

The advantage: 

The Lenovo IdeaTab S2110A features fast gaming performance, a bright screen, wide viewing angles, dual cameras, and Micro-HDMI.
The unfavorable: 

The design is shoddy and screen warping is rampant when handling the device. Its price is too high given the quality and quantity of its offerings.
The offer: 

The Lenovo IdeaTab S2110A offers a great-looking screen and fast gaming performance, but comes up short in build quality and features.

The Amazon Kindle Fire

Amazon has completely redesigned the Kindle Fire's interface. It's sleeker, more streamlined, and feels more mature, eschewing the toy like quality the original had. Fonts are sharper and light and dark images feel more contrasted thanks to the new interface's darker tone. The carousel interface is still here, but scrolls faster and smoother, with app icons rendered in less pixely forms. Apps can be removed from the carousel at will and/or added to favorites, which appear at the bottom of the screen, negating the need to scroll through your entire catalog to find the app you want.

The advantage:
The Kindle Fire (2012) improves on its predecessor in three key ways: faster performance, a better interface with cool new features, and a significant price reduction.
The unfavorable: 
Designwise it's the same Fire from 2011 with no HD video support, no camera, no HDMI, no storage expansion, and no volume buttons.
The offer: 

The Kindle Fire (2012) takes it up a notch in value, but is tethered to the same design oversights of the original.

The Wikipad Gaming Tablet

The Nintendo Wii U is not the only tablet-based gaming hardware launching this fall. Wikipad is a new 10-inch Android tablet designed from the ground up to work with a proprietary game pad dock.

Powered by an Nvidia Tegra 3 processor, the Wikipad can download games from Nvidia's Tegra Zone store, Google Play, the PlayStation Mobile platform, and other app stores. Unlike other Android tablets that can also play a wide variety of games, the Wikipad's unique selling point is its custom handheld controller dock, which adds two analog sticks, shoulder triggers, a directional pad, and four buttons -- all of which makes it look a lot like a PlayStation 3 or Xbox 360 controller.

It is very thin and light, weighing 1.2 pounds and only 0.3 inch thick. The back surface (which is matte black plastic) has a small inset ridge running around it, which acts as a finger grip, and also helps guide the tablet into the game pad dock.