If you are comfortable with the cost, then that is an *excellent* tablet.
Battery life with a new battery is in the order of 4-5 hours. If you only have the orginal battery with that came with the unit, then expect a battery life of 2-3 hours.
The T1x00 range is small and light, especially if you detach the keyboard/base. Performance on the T1100 is quite good (the T1000 is slow, and should be avoided). The digitizer is a Wacom and uses a pen with no batteries (unlike the T1000).
I have a T1000 (The t1100's predecessor with a non-intel CPU) which is rapidly approaching its use-by date. The pen needs a AAAA (not a misprint) battery, and even though I have 2 pens and 768MB of RAM in the unit, it is getting very flakey in tablet mode. It lives in hibernate with 3 or 4 book/magazine readers preloaded, and is still the best unit for reading Zinio magazines that I have, as is is easy to treat as a magazine when sitting on the couch. Due to the 3 pound weight. I keep whopping libraries on it as it has 30GB of storage.
The next lightest full tablet I have is 4.4 lbs (Toshiba M700) and the Toshiba M4 (best screen at 14" 1400x1050) is 7 lbs and flat not comfortable to read on the couch.
If you are comfortable with the price, and especially if you can buy a new battery for it somewhere - then that will be a good reader for .LIT and Zinio magazines. There are also Mobipocket readers, Ereader, and it will happily show PDF's in portrait mode.
Like anything that weighs 3 lbs odd (plus power pack), it is not something that you casually throw into a briefcase as a 2nd reader. But it will be a great reader for around the house.
I am tearfully going to abandon my T1000, if I had a T1100, I suspect that I would still be keeping it for a couple of years yet.