The grinder works well but the velcro that attaches the sandpaper to the machine is the biggest weak point. Ideally, good quality sandpaper should be discarded as the velcro will fail long before the paper is used. Other than that it's a good little grinder, easy to use and I haven't had any other issues with it and have used it a lot. Perhaps some sort of mechanism for "buckling" the sandpaper, like many of my old tools, would be a good output.