There are a few people that have tried them. I've heard good things about them but I've yet to see a flight video with it. They say it's not much heavier than the stock head. Without flight video in the hands of someone who can put the blade thru it's paces with both the stock head and the cnc head it's hard to say if it's better or not. I've heard that it wears just like the stock one which requires repair after some time. It also uses the stock CP2 control arms which are a known point of slop. So it's an unknown really. All the reports I've seen are people that have gone brushless and I have not read any reports from people with the brushed motor with the CNC head.