Old Planet Audio amps like the BB Series are good. I would stay away from the newer ones, unless you are getting an incredible price on them, then they aren't that bad, but remember, the Planet Audio amps (newer) have the same exact boards as their cheap-*** cousins Power Acoustik, so why buy a Planet Audio when you can save $$ and buy the Power Acoustik? The only differences I saw where that the Planet Audio amps have nicer heatsinks and actually use standoffs to stop the board inside from vibrating whereas the Power Acoustik amps did not.... So maybe a little more resistant to vibration damage than the Power Acoustik, but not worth the prices I have seen the Planet Audios selling for.... Anything made by Zed Audio is good if you can find the stuff.... The old planet Audios were Zed.