It's free to try it out, so well worth it to see how compatible it is. It works fully for 30 minutes, then slows down to a crawl in demo mode. But that should be plenty to be able to tell if you wanna take the plunge with it or not.
I've found the compatibility is pretty good for system-friendly stuff, but for most older games you need an emulator instead. So I guess it depends on what you want from it.