Ive used several of their amps and had no problems at all.. They need air to breathe, as they get a bit hotter than other amps, though its never been a big issue for me. Bottom line, a lot of bang for your buck. As for their subs, I have heard a couple systems with them, but never owned any myself, so cant tell you how they hold up long-term. As for just hearing them, they didnt sound bad at all. In the end, I would buy an amp from them without hesitation, but wouldn't purchase any of their subs.