I have purchased 2 of these to use in 2 injora builds, I'm using 40.3:1 gearing in a straight axle and a 24.4:1 gearing in a portal axle in the other. Using the app allows you to program the throttle curve and fine tune it to your driving style, it also allows you to choose the low battery cut off and amperage limit to the protect your electronics. So far both systems have been running flawlessly.
