I have had the Mach 1 for over four years as well. I did get the ear pieces made at a local audiologist. The ear pieces are made well and have lasted. The sound quality is great, I have even had the battery go dead and not noticed for some time. You do have to be careful when you put the headphone part into the earpiece. The tube on the earpiece can gouge out some of the material and plug up the tube. Easy fix using a staple to clear it out. Overall they are great in a Jet and have worked well on occasion in a 182.