My wife and I actually have a 1993 Trek T-100 and really enjoy it. We purchased it in 2005 for $600 so the asking price may be a tad high. We try to do about 4-5 group rides a year ranging from 30-60 miles. Weather permitting we ride on the weekends. Here in NC we have some rolling hills which puts some stress on the bottom brackets. Last year I had my LBS overhaul it and he told me the BB bearings were just about shot.
The original rear wheel developed a circumferential crack and needed to be replaced. Find out if the wheels are original. If so, be prepared to replace the rear wheel. (and for sure the $600 is too high) The front wheel is ok. I did not replace as I don't care that the wheels do not match.
It's a good bike, I'm sure you'll like it and have many miles of enjoyment...