I know what you mean. I told that exact thing to the Stihl rep at our open house last spring. He got that "oh crap, here it comes look", but he ended up being pretty cool about it. I asked if Stihl would be coming out with something like a 650 or 700, and he said no. They had no plans to go bigger because to be able to keep up with the EPA regs the machine would just be too big and heavy, which is what they consider their strongest asset right now in the 600.