Yeah ive had problems with motionjoy not being able to distinguish which usb port my dongle is in, the only fix really is, use 1 dongle that so it doesnt get confused. when i plug in my steering wheel it messes up.
Also, you lose the functionality of charging your PS3 controller while playing on your console at the same time. Once you plug it into your PC which has MotionJoy installed, it's linked up. Signal gets cut from the PS3.
i have 2 ps3 controllers for this very reason, one for ps3, one for pc, my pc controller is charged thru my DVR box right under my tv, just a 6 foot usb to mini usb, i can switch wired/wireless no prob. its to each their own really, some people just like a certain controller.
in case anyone interested i dug out my dongle purchase from a few years back this one works fully with motionjoy http://www.newegg.com/Product/Product.aspx?Item=N82E16833156069
deactivated on newegg, probly 10 bucks on ebay. yep 10 bucks Edited, Jan 20th 2012 9:58am by RippedApart