I did not have a very pro-longed exposure to them, there is a chain of stores called SOUNDTRACK AUDIO and they have these in thier theater rooms for demo purposes, this same music chain is also called Ultimate Electronics and Audio King (i believe) in several states, if they have them there thats one place you can look.
Anyways, i was messing around with one of them and it diddnt take me long to realize i definatly want one of them. Personally i think they make fantastic subwoofers.
I still have a Definitive Technology ProSub 200, it sounds great wth movies and also blends in with music pretty well.
Definitive Technologys makes great home theater gear, very hard to beat especially with for the price. you might be better off getting something else like a REL if you want something for just music, but i would never hesitate to recommend thier subwoofers.
good times good times....