I have several problems with silver motors. Get hot with tri blade 31mm props in my acrobee. I tried on 1S and 2S with the right PID settings. After a few flight the motors started to make a strange noise. I tried 2 sets and had the same problems.
Put these on a beta65 frame and using a 2s bt2.0 pigtail.
Fast shipping and smooth motors!
Also great bonus stuff!
Have over 100 packs on these running 2s. No issues at all. Really cool feature is the solder pads to change the plug or wire wish more motors where like this