Oh yes, I've got 3 and access to a lot more. But got to say the MusicLab ones are the best for simple rythem backing production.
Bit of a pain to coordinate single strums and notes vs. rythems, and this is where OP and/or the plug has a little bit of difficulty. But other than that, these plugs are the best production tool for creating guitars I've seen yet.
The funniest to me is on their site, and I think it was in the KVR comp is the 'Struminator' plug, allowing one to use their Guitar Hero toy to act like a real guitar. Now THAT I would encourage someone to go out, get and learn the REAL thing then.