I bought this to have as a spare. I am paranoid these days about companies staying in  business. The device this is for, The Drill Doctor 500X has worked very will for me. Customer Support has responded to all questions I have had. I would recommend the Drill Doctor to resharpen your drill bits. It is up to you to determine which model will work best for you but for me, the 500X does all I need until they improve the model that sharpens spade bits.