I have a set that are 10 years old at one location and a set that are 8 years old at another. The only thing I've really had to do is switch to the XE validator (some like Mars or Coinco in them) and upgrade to the GOLDLINE BUTTONS which you won't have to do. I've changed the face plates, cleaned them up and they look brand new again. I think I had a controller issue once about 7 years ago on one of them. No experience with the others mentioned. Good luck...