I just got myself a pair of Forte IIs in lieu of a pair of Linn speakers I've used for nearly 15 years.
Going back to Klipsch (owned Cornwalls before that) made me notice some of the things that I've been missing, that I really like. Namely, the Fortes produce a "big" sound that has lots of energy and drive. Fills out the room very nicely. 99db/w/m effeciency makes them mate well with low-powered tube amplification.
My Linns admitedly are more accurate, more detailed, more like true monitors, but I just find the Fortes more fun to listen to.
As they say: YMMV. Personal listening preferences, I'm sure, have a lot to do with it. Anyways, $350 is an excellent price, they can go as high as $650 if in excellent condition. Typical is $500. Deserves at least an audition.
FYI the IIs by comparison use a newer Tractrix horn which smooths out the mids compared to the original Forte Is which use an exponential mid-range horn, and the IIs also have a 15' passive radiator which extends the bass down to 32Hz vs. a 42hz cutoff in the Is B-R design. In theory and practice, the IIs should be better, but there are some on the Forums who prefer the Is. So there you go.
Also, check out the Klipsch Forum as jt1stcav mentions. A lot of cheap tweaks you can do (which I am in the midst of doing myself). These include upgrading the caps in the xover, as well improving some of the internal damping/wiring. These were built to a cost-point way back when, and improve quite a lot with some TLC.