A great little grinder for fine work for its purpose. I have one with a 3" head and got tired of changing pads so just bought another one. I often use it for the finishing touches of various large pieces of wood that I make on a lathe. I bought a few of these and gave them away, they work so well. This is a tool with a purpose and if it is not used for its intended purpose, you will not be satisfied with the results or the tool. Duration of use requires a fairly large volume of air, says Reis. about it before you buy it. Don't blame the grinder if the airflow isn't good enough. This is a reverse osmosis grinder designed for finishing. If you have to aggressively remove large or coarse grinding surfaces, you have the wrong tool. You need a grinder that isn't designed for the job.