I have a STF2, it is a excellent subwoofer. I wouldn't use it in a large room, but for its rated room size it is superb, especially for the price. I used it for more kick in drum and bass music, so I really used it, but it is excellent for more delicate material as well. There are better 10' subs for music out there but not for the price (I'm thinking of the Outlaw Audio ECS10 and the JL Audio F110). The only comparable sub is the LFM-1 compact from Outlaw Audio, but it is also a HSU design, and I doubt it is substantially better.