It's a good gearbox I must say, it's the chosen build platform for amped, with that said it works as should. I would have given it a five-star if it had better quality screws. Very soft Phillips head, I immediately replaced them with grade 5 flat head hex Drive screws. Also didn't care much for what they called a satin finish which was a sandblast finish. But the functionality as well as the ability to Center definitely keeps it as a contender. If they could incorporate a vertical centering boy that would be nice.