The Matias TactilePro page says boldy:
Built like a tank.I'm not sure any keyboard I've ever owned has died within five years. Generally, keyboard are trouble-free, as long as you ignore all the crud that gets trapped in them, especially if you have animals that shed. If you really want to be seen as standing behind your product, you'd have to do a lot better than that to impress me.
The Tactile Pro Keyboard is built to last, and comes with a 5 year warranty.