I shopped all day before deciding on this tool and compared it to Walter and cheaper brands. It does a good job on all my angle grinder work without my cheap Kawasaki vario speed. The anti-collision circuitry worked well, working twice for me and 20 times for a newbie. The air filter and air-cooled battery pack are a revelation. The tool's weight balance is such that I can rotate it in the air to set it in position, just like I do with my hammers. You can't do that with a corded grinder! What I don't like is the stupid spindle wing nut, which is actually harder to loosen than a regular wrench nut (comes with both). Crate. But the rotator works, it can rotate under the action of force.