I have used various models of wired and wireless Cateyes, and one wireless Sigma. The Sigma stopped working after a few years, becoming completely glitched out. I think water got in there somehow. None of my Cateyes have every failed, but were stolen or lost at various points. I'm currently on a wireless Cateye Micro. You can't go wrong with this simple computer. I've also used a cheap department store computer once when I arrived on a tour and realized I'd left my computer at home. It worked fine and was gifted away later.

Consider getting a wired computer as well: they only use one battery, a huge benefit.