Guitar Rig sucks. Mostly it can't do anything close to decent distortion, and of course since it's real time audio processing you have to have a good soundcard like an X-fi or else you get simply unacceptable latency. I tried (aka pirated) it and was like "screw this" and then got a Boss GT-6 (which is long discontinued, was even discontinued when I got mine). Does everything Guitar Rig does other than playback and recording and it all sounds better too. Of course the last time I used Guitar Rig is was version 2, now it's up to 4, but I'm sure it still sucks.