UPDATE 6-3-2019 After countless hours of work, sometimes 4-5 hours in a row, it still works just as well as the day I bought it. I recommend a small inline flow controller or set it to 90psi, it runs more stable and makes big strokes, if it's too high on psi it won't run at full stroke in either direction, lube it up before use and sometimes with it of time and it will last like high-end instruments. I have an auto repair shop and all high quality brand name tools. I have a Hutchins 390.00 die grinder and it's not half as powerful and sends a lot more vibration to your hands. This airboard has rubber grips, which comes in handy when you're grinding for hours. I would recommend this tool to anyone who needs a straight grinder. I can't rate the durability of the device as I've only had it for a few weeks. but judging by the quality "out of the box" it will be a durable tool.