I got it on Steam during their summer sale. I like it. I haven't played every Guilty Gear game out there. But from what I have played I kinda feel if you like one, you'll probably like all or at least most of them. If you like wacky fighters that actually play well, this is for you.
I don't have the Rev 2 update yet, but my version did include 3 DLC characters. I'll probably wait for the Rev 2 update to go on sale.