Wow thats pretty vague info if you ask me ...
I considered buying one of these at one point. It was HUGE and ugly and old. The user reviews were good though. Its age made me have second thoughts, the last thing I wanted was a huge ugly sub with an annoying little humm or something like that.
I would only buy it if you could listen to it first. That was my problem, it was a major drive, and the owner didnt really have it setup for listening.
I ended up buying a huge used Infinity, that wasnt too old, or too far away, and the owner was eager to hook it up to his Revel system and show it off (Thats always a good sign). I also asked for a written 48 hour money-back-warranty, in case some annoying buzz appeared at home, I assured him I would only bring it back if it was something major like that.