I tried GP5 just now and it kicks azz !!! :cool: It looks pretty much the same on the outside, but the sound is totally different. The RSE (realistic sound engine) is what makes Gp5 so great. It's almost like having a live band playing the tabs for you. Other things that are new are; more preset alternate tunings, wah wah sound and of course alot of new variations on each instrument. If i hadn't already "bought" it, i wold buy it. definately worth the $$$$