Power Acoustik is awesome amps. They are the best bang for the buck company. I am a firm supporter of their products even though their customer support. Although since i am a dealer if anything every craps out on me i can bring it back for a return within a year. But i have not ever have to bring anything power acoustik back.
I wasn't that impressed with the PA I had (OV4-800). Supposed to be 85x4. I seriously doubt it gets there. It was about in-line with the US acoustics 4085.
For about the same price you can get ahold of a Lanzar Vibe 430 which is significantly more powerful than the PA, especially when you bridge it, or run it at 2 ohms stereo.