I have owned 6 computers and a bottom timer in my life in my life.
1. The Suunto I bought in the last millennium worked fine for many years. I replaced it with a Shearwater a number of years ago and sold it to a friend who later sold it to someone else. As far as I know it is still working.
2. I bought a Uwatec (can't remember the model) to be a backup to the Suunto--got a good Key man discount. The battery kept dying. I shoved it in a drawer and forgot I had it for years. I later tried to see if it could be fixed so I could sell it, and I learned it had been recalled. If I had turned it in during the recall period, I could have gotten a new computer, but no one told me about the recall. I tossed it.
3. I bought a Uwatec bottom timer during my no-computer-for-tech-diving period. I used it until the battery died. (It can't be replaced.)
4. The first time I needed a multi-gas computer, I bought a used Nitek HE on eBay. It worked fine until the battery died. I stuffed it away for a while and then gave it to someone else who had the battery replaced. As far as I know it works.
5. I bought a Shearwater Predator which worked fine until I sold it to someone else and bought a Petrel.
6. I still use the Petrel, and have only had to change the batteries.
7. I own a Perdix, and have only had to change the batteries. (Yes, I use two computers.)
Quick summary: the only computer I have ever had fail was the Uwatec, and I can't remember the name of the model.