I've had two Micro Wireless units and have had trouble with both of them shutting down in <40 degree weather. Someone on the board suggested that the fork sensor be mounted closer to the top of the fork because the battery performance is diminished in cold. I haven't tried this yet but it sounds reasonable.

After the 2nd failure, I switched to a Strada wireless. I haven't had any issues with it but it's only been a month. As far as display and ease of use, I can live with the Strada or Micro Wireless.

I have had a couple of excessive MPH readings in the last couple of years. Nothing major.