At first I had doubts about buying this product. I mainly use it for grinding welds in tight spots that I can't reach with an angle grinder. I have a Metabo compact straight grinder, but I can't get to the weld seams with it. I was concerned about performance and battery life. I used this tool extensively yesterday and today on a complex assembly with multiple intersections and bottlenecks with curved surfaces. It was difficult to weld. This tool works well - it has the power to grind welds and the batteries last long enough and charge fast enough that I can keep going after changing two batteries. I'm a fan - glad I bought it.