I heard of the p3000.1 and yes it's the older generation of massive audio. I personally wouldn't buy that amp after researching and talking to people who had experience with it. Every P3000.1 that i've came across has either been broken, or only half the amp works(The P3000.1 is really two 1500s strapped in one board). However, if you have the alternator, batteries, and 0 gauge wires to back it up, it wouldn't hurt to offer him a price. I wouldn't pay over 300 for it.