Several years ago I bought a C'man router combo- 320.27683. As best I could tell at the time, it appeared to be a rebadged Bosch 1617, with a few cosmetic changes (color, different power switch, base handles). It was okay, but nothing special. I recently bought a genuine Bosch 1617 for my router table. No comparison in motor smoothness and quietness. For kicks, I tried putting the C'man motor into the Bosch fixed base. Turns out while of similar design, the locating pin on the Bosch motor doesn't fit the corresponding slot in the base. In hindsight, I'm pretty sure the C'man is a sloppily reverse-engineered copy of the Bosch design. Now I see there are some old posts about it, including mention of possible patent infringement. At least my lesson didn't cost me a bundle, and I can use the C'man for non-critical work.