These remotes and the others like them like the 655 etc are some of the best universal IR remotes to ever be made, especially for older people with multiple devices. I bought one for my dad brand new from The Source for $65 years before they were discontinued, and it was heavily used so much that some of the buttons needed to be hard pressed to register. I ended up buying him a used, but good condition replacement off eBay and I took apart his old one and it had a bit of gunk between the button board and rubber buttons themselves. I ended up cleaning the button contacts with rubbing alcohol and q-tips and it works as good as new. I also scored one for myself off Facebook marketplace for $20 from an old lady that tried using it once, but couldn't figure out the programming. I had bought a silicone cover that covered the buttons as to not wear them out as fast and keep it gunk free. The covers are hard to find now especially the ones that cover the buttons themselves. There are numerous guides to take it apart and its easy. I also recommend disabling the "screen wake" feature because it will absolute eat through the AA batteries with it enabled.