Good. It saves one step and about a third of the time. You'd want to be using it on the same machine though. I dont know how Macs work, but cloning one drive and using it on a different machine will usually cause problems, if it works at all. If you plan to use the drive on a new machine then you probably should do a fresh install. New drive on the same machine is good unless you're using a larger drive. That does get more complicated.