5 stars for durability but 4 stars for battery life. 24 linear inches at an angle of 1/8" x 1" with one battery. If you're careful to avoid tethering, you can get more out of a single charge. I also bought a grinding wheel and a matching guard. It works, but the battery life is disappointing. I would use a connected device for almost all sanding jobs. Wirewheel performance was acceptable for short post-weld cleaning passes. You will only be disappointed if you try to prepare large areas with it. Bottom line: I would recommend it for short (a few minutes or less) wire or cutting wheel work, but only use it as a grinder if the location doesn't allow for wire. grinder work.