It's tight and seems to be well made. I was thinking a harmonic drive would be better. I suppose the word poor isn't accurate. I have concerns over the belt, which I can stretch with my hand.
I made the bronze dead center and milled it at 60 degrees while in the collet to get it as perfect as possible.
Deepgroove1 on ebay sold these, but i haven't seen them in awhile. The company that makes the belts and pulleys is Misumi USA