I have the t700 and for the first few months it was the best purchase I've ever made. Then the slowness started. Unless these devices are regularly formatted you're going to experience unacceptable slowdown. I blame the RAM, 1GB is not enough for what these devices are attempting to do. Full HD 3D rendering, multitasking, and background downloads just cannot happen on 1GB of RAM. 2GB would solve this issue, but sadly it's not expandable and I find my tablet spends most of its time in my bag while I use a "real" computer. This only exacerbates the problem because the longer the tablet spends turned off, the longer it takes to "catch up" with all my emails, calendars, app updates, etc. I've started an experiment where I keep it on and active at all times in a dock on my desk and grab it for meetings and whenever I go outside, but we'll see if keeping it always up-to-date helps at all. I formatted it yesterday and it's much more responsive, maybe constantly forcing it to be "like new" is what you need to do to make these usable.
To be clear: I'm a software architect who multi-tasks a LOT more than most people. If you want to check facebook and watch a movie, this tablet is more than adequate. If you're looking up software documentation and generating large documents which you're then sharing via screen-sharing to people across the continent, use a real computer.