I've used just about EVERY cycle computer on the market and most of them work OK for awhile and then fail one way or another. The only one I've had that doesn't seem to fail is the Cateye models. Though that might simply be a freak.
I used to have Avocets on all of my bikes but as soon as you replaced the battery they wouldn't work after awhile. Lately I put SIGS on all my bikes and they worked very good for about 8 months and then three of them started showing "miles" but reading "kilometers per hour". Reseting had no effect.
Avenir as well stopped working for no apparent reasons. Vetta worked OK but then they got to be hard to find.
The Cateye seems to just keep on working though. But I'd bet as soon as I put them on everything they'll all quit at once.