So far I've gone through 4 of these computers and I was wondering what other riders are using. I've had 3 wireless and my current one is wired. I sent two back to Cateye and they replaced them after they ran a test on them, but I'm still having the same problems with the ones they send back to me. Every time I get around 20 mph it shows 0. More so going down hill. If I sprint at 20 mph it goes off. If I stay pedaling at a steady pace and pick up my speed gradely it's OK. The only thing I lose is the speed reading, all the other functions work. I was thinking about trying the Specialized computers, but I don't know how they would be. I tried the Sigma and I didn't have much luck with the either. Anybody have any ideas, thanks.