As my unti failed to register various training data points for Vo2 max my dealer swapped my unit for a fresh one. Although I do not believe the hardware was at fault the technical department of Garmin Netherlands thought so. I seriously thing it's the software, or firmware if you like. These are complex watches with even more complex software and I have yet to run into a Garmin device that has no bugs. I mean all the CX and Montana GPS devices I had had many, my F5 had them and the Plus is crawling with those pesky bugs too. Anyway, hope my battery is as good as in the other unit draining only .25% per hour...
