For the OK Hobby 4-pole buggy motors I can say they work better than a Feigao-type 540XL 2-pole, but still get hotter than a Castle or Tekin. It wasn't a waste of money, and does work, but I wouldn't buy one again.

They also have quite long motor leads, that are extensions of the windings (like a true Neu motor). This basically makes it impossible (or at least very difficult) to shorten the leads, and the wires are more stiff and likely to break than silicone wire leads. Silicone wire or solder tabs would have been a better way to go.

Overall I'd give the OK Hobby motors a 6 or 7 out of 10. Not bad but not great either.