That looks like a solid unit, and from what I could tell from the Ebay description the manufacturer seems to care about his product. I could never find the right combination using drills/power screw drivers to comfortably power my Forster trimmer. So I made my own. Bear in mind that I have probably at least $50 in parts between the motor, Forster power adaptor, shaft coupling, brackets, lamp cord, and knob so the Ebay unit isn't too bad of a deal IMO. It definitely looks more professional!
View attachment 1207552