Great info guys- I'm also looking at the 161 vs 121, it seems like if your going to put that $ out there (or debt) why not go for the 161? Maybe the 121 for smaller residential applications? But what about for stonework, boulder work, driveways, small lot clearing etc.? I guess transporting is the biggest issue, 121 fine with a 3/4 ton truck probably need at least a 1 ton for the 161. Just how much heavier duty is that 161? Welcome comments from owners of both- Thanks!