ive never personally used a planet audio amp but have used a few of the newer fusion amps. as far as the fusion's go they are solid amps with great power and they tend to put out more than they are rated.
the fusions are ugly as sin!! Big Bangs are solid as well! //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif
well i personally own a fusion ppam2001 amp i like it alot it pushes out good power and can even do a quarter of an ohm daily the only downfall that i exprience with my amp is that my radio stations dont come in very well but if u can live without ur radio stations then consider it for the price and the power it gives you, you cant beat it
i have decided to get a new nv-25001 by fusion to replace my mtx 8100d. from what ive been told, this amp will run at .33 all day and at 1 ohm had over 2200 watts rms. also it nice to the electricial system of the car- thats a plus