I had a body shop for twenty years. Spent more time behind a polisher than would be believed if I stated it. Polishers for automotive use were all 2400 RPM. It was either on or off, and no variable speed. When trying to feather in an area, I used to feather the switch on and off intermittently. This polisher by Makita takes it to the next level. The moment I took it out of the box and plugged it in, it was preset at one on the speed dial. I squeezed the trigger, and it crawled around so slow I couldn't believe it. Then when setting it at a higher number it gave you variable speed on the trigger. That way you had the option of adjusting by the trigger, any speed up to the preset number. Additionally, you could press in the lock on, and it would remain at a constant speed. In plain words, every option was considered, well thought out, and integrated into the tool. Leave it to Makita to make another dead on accurate tool. Add to that the built in smart electronics, which gives you just the right amount of power to keep it running at the preset speed, even when it encounters more resistance. That keeps the speed constant.