I've got it, and I've used it. But not much. It's unnerving, because I'm so clueless about what's going on. I like the old days, when everything pertaining to a program was in its directory, or its sub-directories. I can't stand it when a program tosses bits and pieces of itself all over the place. The result is a hard drive that's mostly filled with mystery files. Good ol' Apple DOS let you run a clean machine. But that was long ago ...
It would be nice if Windows had a viewer that allowed you to see each program's registry entries. I've never figured out why there isn't a third party program for this.