I have an Asus EeePad transformer tablet, plus the docking keyboard/battery, so the onscreen keyboard is not an issue for me. I also have a 17" Asus RoG laptop with an i7 quadcore CPU and 460M GPU for gaming, so I feel qualified to compare the two
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The lappy tends to get heavy in your lap, plus a bit on the warm side whereas the tablet does not. The tablet also does some cool things the lappy does not, such as act as a nice remote control for DLNA-enabled TV's as well as any Windows 7 or Vista PCs (obviously you have to set permissions on each PC in order to use the tablet as a remote). So if you have an HTPC or an iPod or some equivalent entertainment device, the tablet is great. I just need to search a bit and see if I can control my Zune with the tablet, since when the Zune is docked to my stereo across the room, I have to use a telescope to read the screen
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That said, I do use my tablet as a Kindle reader pretty frequently. My wife likes it for browsing her Yahoo email, Yahoo news, etc - unfortunately Yahoo doesn't support Android for Yahoo Chat (or whatever they call it now - Communicator or some such 50 cent word). But you can download the Skype app for free and do video chat with any other PC, or call any phone. Of course you can do the same with the lappy as well, but it is more cumbersome esp. if you wanna walk to the kitchen or something while chatting, which my wife does. Of course, she also calls people while sitting on the toilet in the morning - I'm just waiting for the time when she forgets to turn the tablet camera off
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As for speed comparisons, fuhgeddaboudit - the lappy is much, much faster than the tablet. Of course, the tablet runs some 8 hours on its own battery, and about 16 hours when docked and using the keyboard battery in combination with its own.
The touchscreen is quite handy for zooming, rotating & panning stuff like maps or pix or video on the screen, certainly far better than using the touchpad on the tablet or lappy, and better than a dedicated mouse for selecting, dragging, etc. But you hafta clean it every so often, unless you like looking at fingerprints.
The tablet also includes a 5MP front camera in addition to the 1.5MP rear camera for video chatting. Haven't taken many pix with it but it seems OK. I do have a 16GB microSD card for storing stuff, but the tablet itself has 32GB memory. So I can download a boatload of free flash games without worrying about storage issues.
Other goodies include a GPS tied to Google maps, but of course you have to be on wifi to connect. My particular model doesn't include 3G or 4G sim card capability, but then I was just at the Verizon Wireless store this AM and saw a 3G/4G USB adapter for $49. Of course that will cost you something like $30 a month for 2GB of data usage as well, which is why wifi is so much better & faster to boot
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I'd suggest browsing an appstore (Google's or Amazon's Android appstore in my case) to see what is available and what a tablet can do...