I agree. I also ditched HRM on the bike, but even found something as innocuous as a Fitbit a burden. When the Fitbit worked, it worked well... but then after a

I agree. I also ditched HRM on the bike, but even found something as innocuous as a Fitbit a burden. When the Fitbit worked, it worked well... but then after a couple of weeks it broke and when the utility and value of it has fallen away it is immediately an annoyance. I think, for Google, that ensuring that the value proposition is quite solid (mature offering of services via Glass) that it will do well. The worst thing for them would be to launch too early when the value is not yet proven, and for poor network connectivity, poor software, to turn the "Wow" into annoyance.