I own a pair of these, this is a VG deal.

Flexible and effective sub with lots of features. You can even high-pass your mains running this sub high level. Nice feature, if only to just play around with.
PS: the dealer told me the "auto" feature doesn't work properly and is a known "problem" with this model -- the music doesn't trigger it properly. So sometimes the sub is off when it s/b on, and vice-versa. So it's not an isolated problem with yours. No biggie IMO, I just leave it "on" all the time.