I am running greenteeth on a 1665 AC. They were on the machine when I got it so I don't have a fair comparison. I can tell you that they cut fast when sharp. They are tough, I've chipped a few on granite. They are fast to change,(nice in the rock country that I grind in). They advertise three new cutting edges but in reality I would say two. There isn't much left of the third edge when you get to it. I sharpen them on a bench grinder with an electric drill spinning them. It seems like I can get about two sharpenings before they don't give enough clearance to protect the pockets. I have no plans of changing at this point. If you get greenteeth, go with 1100 series. THey are for higher HP machines.