Precision Power was great, pre 2004. Then they were bought by DEI and the quality went downhill, plus they turned **** ugly looking! but anyway....
Their Art Series amps, made from 1993 to 1996, were some of the best amps ever made. Hand manufactured in Arizona. I owned two of them myself, the A204 and an A600. The Art Series amps didn't come with built in crossovers, unfortunately, but the power output was underrated and they have impeccable sound quality.
They ended the Art Series, and in 1997 they started the PC lines (Powerclass), in '97-'98 they made the "muffler" generation, lol. Some didn't like the design, but I think it's alright. I have a PC650:
For 1999, they came out with the chrome series. These were rumored to have overheating issues, but mine hasn't had that problem.
'00-'03 was the silver finish generations, the PCX series. The last of the good PPI. 2000 and 2001 had the smooth top, 2002-2003 has the raised up center top section like pictured below.
I did hear the name was bought by new people, and they want to return it to respectability. If you've seen their 2010 line, it looks a hell of alot like the '01-'03's.