Wintech Ultimate USB Cycle Computer

I've got 3 of these and they are great WHEN they function properly. There's a recurring issue with the heart rate function on them all, however. Sooner or later the heart rate function stops working properly, and it's absolutely maddening to try to get this resolved. Mavic itself has been singularly unhelpful with this problem. If you get a Mavic computer for your bike, you will most definitely need some sort of backup for your heart rate if you don't want to spoil your training. Tom