I just got the RS10hp for Christmas. It is aweomse. It works perfect in the car. Be sure to get the RS not the EL series. It's more money but is a lot better. A friend of mine that helped me install it says that it sounds a lot better then what he thought a single 10" would do and that it is better then some 2 12" that he has installed. I got it from www.dealznet.com for $230 plus $30 for shipping which is the best that I could find. It does take up a lot of space but much less then a box and amp would and is very easy to take out temporarly. It is plently of bass and sounds good. I can't stress how important it is to get the RS and NOT the EL. For $260 total it was well worth the money and is a lot cheaper then other subs. I say go for it. It's easier to intall then others too.