i just received these today:
Parts finish was ok, it was not as highly polished as the Yokomo ones. But at least it's machined and is lighter than the stock steel?magnesium?? ones. I don't have a scale to try quantify it though.
Blue is definitely better than grey
Some minor issues:
1. Some of the screw holes are not threaded/tapped deep enough. As such 2 stock titanium screws I was using had to be replaced with shorter ones. Including the longest button head screw with the spring support.
2. The motor clamp's last fin is too large and touches against the rear-right chassis brace. Nothing that my dremel couldn't fix.
Overall, it looks damned pretty on my CGM now and being lighter surely helps.
All for only US$15, way more bang for the buck than Yokomo's!!