I have one on mine.
I haven't had it installed long though, but so far I really like the lower speed and higher torque on the low end.
I have a two speed headstock and I retained that feature.
I bought pullies and a speed POT from ServoKits/Custom Crafters.
Part of my install was a fools errand though, I added additional support under the headstock which moved the motor back farther.
That created more work than it was probably worth for what I gained, and I barely was able to fit the drive belt and forward/reverse back in. But hey, it kept me occupied on some cold winter weekends.
I thought I would eliminate some bed flex, which I did, but it just flexes everywhere else now.
I would install the motor again, I would not bother with the reinforcement though.
If I would've had an old Parker controller and a servo motor or some other surplus or used controller and motor I would've used it instead.
But for the price it's hard to beat these, longevity remains to be seen yet though, I guess.
Size factor is perfect too, if you mount it in the stock location. These are smaller than any of the name brand servo motors I've had in the past.
Pullies were the hard part and that's how I found Custom Crafters, my lathe was tore apart so I couldn't make any, timing pulley blanks were more than I wanted to spend. And I didn't want v belts because I didn't want to run that much tension, which may or may not be a valid concern.
But I had no real plan when I started, I tore my lathe apart and then decided what I was going to do on the fly. Never the best approach.
I didn't take many pictures, but some photos are better than no photos.
The reinforcing plate and added a 4th headstock bolt.
The motor mounted, not pictured is the modified forward reverse lever.
