I tried Parallels and Fusion, didn't really see a difference to using Virtual Box which is free and for that alone I think it's cool as hell that Oracle did that. Used Virtual Box for 2 years now, only had 1 problem once, was a glitch in an update but otherwise nothing else. I mainly use Windows on this computer for trading and doing other stuff for business that can't be done or can't be done as good on os/x. And I don't like bootcamping, I'd rather have my desktop switch back and forth between os/x and win7 at the same time, best of both worlds running both OSs parallel to each other.