They all look pretty much the same... difficult to tell. Sold quite a few of the SLD's in the past week and today, nearly out of stock, should start to hear some feedback.
The 5 ZCI's that I've run in the last couple of years on different guns have all been fine, not really noticed any weak pinion gears on them. Seem pretty much the same as most Chinese motors
Pinion gears are identical from what I can see. Taken a couple of shots. Hope that helps a little. As I said wait for the feedback and the video in a weeks time 🙂
Here's some stats the factory sent me over:
Voltage (operating range:6.0-12.0.rated voltage:8.4v) Noload (speed:18500r/m.current:3.7A)
At maximum efficiency (speed:15624r/m.current:12.33A.torque:426g.cm-41.79mN.m.output:69.05W) Stall (torque:2743g.cm-268.8mN.m.current:67A)
Here's a quick product video - next week should have a side by side comparison with the ZCI