Good. when to start The on/off switch is a royal pain to use. Turning on very difficult. The battery lasts about 4 minutes. I bought extra batteries to have spares. Not enough for a small project. It takes about a dozen to work for an hour. When the battery was empty, I connected it to the charger and it blinked red. This means it's too hot to charge and needs to cool down. It takes about 30 minutes to cool down to the point where the green light starts blinking, which means it's charging. A full charge takes a couple of hours and another 4 minutes for work. Then repeat the process. I found it cheaper than Dewalt, Milwaukee, or any other major brand, but they last less than an hour on a single charge. You pay more for it when you buy the required 10+ batteries to get the same runtime as the leading brand.