I hope after 25 years of service it won't let me down like the previous model. lol I bought my first one when I was in high school. Over 30 years ago! It was little used at first until I started using it full time for the same job when I was 23. I'm 52 now and actually I still have it and it works great but the cable has started to snap. He is now retired but I am keeping him as a backup. I'll fix the cable one day. I bought a new one because I use it in the field, so I can't let it down while I'm at work. Anyway, it can't last forever, can it? Whatever it was, the new buzzes just as much as the old. Every workday he gets a few hours of hard polishing. Love it!