i have herd alot of bad things about them. But i like them and my friend has one, his runs great.
i gotta fool friend who has one of them p5 amps. lemme tell u, i hooked em up to my system, and they bump for sh*t. i know it can't compare to my fosgate 800@2 but i think u can do better than sonys. and hear this, he was talking behind my back to my other friends saying that his system outbumps mine!! haha...
sony are sh-t, get a jl, kicker, or even fosgate if your on a bugget. but the new sony subs are pretty good there to good to be powered by a sony amp, so you could get a good amp and save some money by buying sony subs.