I recently got their new subwoofer (PC12-NSD). I had previous subs that I bought for around $300 that sounded boomy and had horrible freq response (contrary to company's claim). The SVS subwoofer sounds very clean, sharp, and accurate. With respectable spl level at 20hz you actually feel the bass. Originaly I was going to buy their top of the line sub but after taking into account the room size and the performance of their "budget" subwoofer I decided to purchase the PC12-NSD ($600).
This sub manages to easily shake my 2600 sq foot detached house. A great buy that I highly recommend.