The battery sticks out at the back so when working on a flat surface with large Ryobi batteries it leans back and the surface with the edge sands off the sandpaper. be very careful The battery life is also very short. It drains Ryobi batteries faster than any other tool I've seen, in 5-10 minutes depending on battery size. As long as you hold it firmly and keep it moving, the results are excellent. I've polished an entire dining table using just this grinder as my only tool and it's turned out great. Convenient if you are in the Ryobi ecosystem. The dust bag is amazingly efficient, but needs to be emptied constantly because it's so small. This tool is really for very small projects.