well supposdly in firmware 3.50 they kept some or all usb controllers from working. I need acontroller but can only afford a usb one.
I have a PS3 third party wired controller, but seeing as how PSN is down and I can't update my firmware, I can't confirm this for you.
They're cheap, but no where near the quality of a real Sixaxis. My right stick won't register until about 1/3rd of the way tilt. svcks hard for aiming because it then kicks in at that tilt so there's almost no precision.
Coincidentally, I've started using movement to correct that aim and it's thrown off more than one opponent.