I bought the top-of-the-line 10" Thrive tablet: 32GB memory with access to 4G. Customers who complain about the speed must have gotten a model with less memory.
The 4G feature is very convenient for travel: I can accees the Internet without having to look for a Wi-Fi hot spot. 4G works well in urban areas, but in rural areas, in small towns that DO have cell phone service, 4G has failed for me. Also, when I bought the service contract for 4G, I was lead to believe that I could suspend the contract at any time when I don't need it (I am not traveling), but now I know that is not the case at all: suspending the service costs you almost as much (per month) as not suspending it.
I like the sturdy build of the Thrive, and the available accessories: leatherette case, spare battery. I also bought a plug-in keyboard and mouse, which I don't use much.
One disappointment: I cannot insert non-English characters into documents with the virtual keyboard. For example when I press and hold the virtual key "a", a small menu pops up: from this menu, one is supposed to be able to select a non-English variant of the letter "a", but, unfortunately, instead of the letter you choose, you get TWO letters (in some cases the letter you wanted, preceded by one you didn't want, in other cases, two letters that you don't want).
The Thrive comes with the QuickOffice software. I purchased QuickOffice Pro, so I could edit Microsoft Office documents, but I was disappointed by the limitations of this software product. One small example: you can't freeze the top and left margins of a spreadsheet, which makes it impossible to work with a spreadsheet of any size. (And the list goes on and on).
Overall impression: the thrive is a useful travel companion, but if you want to get any serious work done on an Office document, you'd better do it on a Windows machine. In a few years, Android will probably mature and so will this tablet.