"Easiest OS switching possible on a Mac"4.5 starson by lvanhelden
Pros: Fast OS switching without rebooting
Cons: Memory usage can add up when running multiple OS simultaneuosly
Summary: Switching between OS is a breeze. I run Mountain Lion, Win7, Win8 and Ubuntu regularly without problem. Sometimes I don't even know what OS I am running, Parallels knows what to use for each app or file.