I've got 2 Planet Bike CCs. One is the Protege wireless and one is a wired that I have on my hardrock.

The guy who sold me my wireless some time later told me he's had issues iwth his in cold weather. I haven't ridden in anything uber-cold here but he said it got flaky below 40 degrees. He said it could just be his or something more broad. He did offer to swap mine out for a Trek but I'm happy with it and will stick with it.