Right now I'm in a state of flux over this issue. I jammed last night with a guy for the first time, and he made the comment to me that while the some of the stuff on my Digitech GNX3 sounded pretty decent, overall the whole thing was flat. I was pissed...this dude was damn near slagging my best piece of equipment. I use a Marshall Valvestate amp with a tube pre-amp, and he told me to unplug the processor and hit the overdrive channel on my amp with the volume around 8. When I did, I was blown away. That thing had one of the most awesome distortion sounds I've heard, and the pinch harmonics just squealed like you wouldn't believe. So now I'm thinking of going tube and just getting a few analog pedals. The digital stuff is great, I won't deny that, but in reality all those amp models are someone else's interpretation of another amp and will never truly sound like the real deal.