I generally read when in my recliner so I balance the T91MT on my belly! If I'm sitting at a desk, then I use it like a regular netbook. I typically read in landscape mode using the two-pages per screen split view. it is a litle easier to hold horizontally for me because holding it vertically it can get a bit to top-heavy, but it is quite manageable either way.

Since I got the T91MT I haven't even used my Sony PRS-300. I'm going to keep the sony for travel and for reading outside in bright light. It is of course much more portable.

Another post mentions the Archos 5IT. I bought one this week, kept it overnight and returned it the next morning. The Archos 5IT is a hybrid Android device with some bad Archos tweaking. It is very non-intuitive, and extremely difficult to get the file manager to work correctly, and does a terrible job with eBooks. Aldiko and FBReader were the only two I tried, but both had extremely limited function and were difficult to use with file manager so imorting your eBooks from your PC was a huge headache. Also the interface was clunky and I don't think it is multitasking. The menu system is extremely bad and difficult to find settings. Even the browser was horrible. For $300 on the low end, it is way over priced and I would avoid it.

BTW: I use FBReader on my T91MT and the Windows version has a lot of functionality that the Android version does not have. This seems to be true of most of the Android apps I used on the Archos 5IT--the equivalent Windows versions are much better!