Got the $30 4.5" DC-500-L Hilti grinder today. Came with case, handle, gaurd, and two lightly-used 4.5X0.24" diamond cutting/grinding wheels. From circa
1998.Now, this is one of the most unusual grinders I've ever seen. 12.7 amp input--does anyone else make a 4.5" grinder with that much power? It seems to have an electronic control module for soft-start (like a big router) and high speed governing. Even has a little light that comes on when the electronics kick in. The switch is a bar/paddle type that's the length of the entire motor housing. Kind of bulky and hard to get a good grip. Lightweight for its size. Has little plastic ducts to direct the outgoing cooling air. Arbor and flanges seem a little short for 1/4" thick wheels.
Other than being very complicated, quality is just as good or higher than the DeWalt/B&D DW402 types I've used in the past. Wheel guard (with toolless rotation) is quite sturdy and only slightly lighter than the others I've seen.
GTO(John)