those subs are beasts. They will put the kickers to shame.I have heard one L7 15" on a ZX1000.1 (I think, it was a kicker zx amp just not quite sure about the power.) It was loud, but that is the only thing good about it. LOL. If your close to me I have two MTX 9510's they sounded much better in my car than the L7 did in my friends ride.
This of course is subjective. I do think there are better subs for the money. I like the amp though.