I've been using a Sigma BC16.12 wireless for years. It works well for me, nice clear display, battery life seems good. Probably a couple generations out of date by now. The wireless does have some delay on the speed calculations for fast changes but doesn't matter for steady use, I believe the wired doesn't have this delay.
My wife had one too but we accidentally dropped it and ran it over with a car.... worked great before that happened though
For most of my use, a simple computer like this is ideal. Gives the stats I need without much fuss besides the odd battery change or twist of the wireless speed sensor if it gets a little skewed.