It matters not what tool is used, as long as the correct amount of torque is applied and the parts aren't damaged. Neither a chainwhip, nor rotafixing, tells you when you over torque or under torque. Rotafix works well if you use common sense. The problem is a lot of people lack common sense. You can generate more leverage with the wheel than you can a chainwhip, but what you geniuses don't seem understand is that you don't have to torque it as hard as you can. I never bothered with a chainwhip once I discovered how to rotafix a cog on or off. Its faster, more convenient, and almost effortless compared to a chainwhip. I've never damaged a cog, frame, or hub. I've never even had a cog or lockring slip.