Bought 2 Sigma 1200 wireless back in March, one for my son, one for me. After a couple weeks his failed. Took it back. After about a couple months mine failed. Took it back. Failed again after another 2 weeks. Took it back for a Sigma 1600 wired. Also got a wired system for my son.

All the failures seemed to be with the received on the handle bar.