That's a decent price on it. If that's all you have to work with money-wise I think I might pick it up. Can't say I know too much about that sub in particular, but klipsch subs sound pretty good. You're not going to get any really low sub bass, but for music it would be good.
I can help you out a little. My buddy has the 10" version and it puts out some nice bass. Not the most musical sub. It has more output at around 50hz or so and seems to sound more like a car audio sub than a home sub. He loves it. He likes the bumping bass and shrill highs. So you if you like bumping bass your in. :R