I bought one at Wausau swap meet this fall. I bought the cheaper one that you can only use with a drill. It works pretty good make sure the carbides are dry. If you use the tool when wet, then you make a slurry that plugs the tool up. I don't sharpen to a point just a much narrower flat and they work great you can turn on asphalt or concrete just fine. I don't think it will last more than a couple more times. If I do buy a new one I would go for the more expensive one that you can use in a die grinder and it will cut faster and should last longer for a little more than double the money. All in all I would say its a good product.