The better question is, who wouldn't run an M150 with HS gears? The lack of torque from the gears can easily be made up for with the motor and battery. On stock gears (21:1) and a 7.4 my frankentorque makes an m150 look like a panzy.

 

In my m4 I run SHS 13:1 high speed gears with a lonex A2 high torque motor and a m120 spring (sub 400fps rifle). Excellent trigger response and the gears seem fine so far. The gears are apparently stronger than a cast metal tooth pison; the metal teeth are starting to strip with no visible wear on the gears. I wouldn't be surprised their higher torque gears could handle a higher spring.

You probably already know but... I learned from experience... you should probably use bushings not bearings in a high stress build like this... 2 of my bushings failed and one of (my old set) shs gears stripped.

 

Well the quality is there at least. Quiet or not. It will give consistency