While everyone is trying to make a watch that looks as traditional as possible, Microsoft is thinking radically different for how the future watch should look likes. That's some guts. At $200 this looks like great device with built-in sensors including GPS and UV that also talks to whatever phone you own. I also like the fact that heart rate monitor is always on. Addition of barometer could have been nicer, however.…
They claim a battery life of 48 hours under "normal usage" (read: no GPS), with a charging time of 1.5 hours. Though if it's supposed to be used as a sleep tracker, I kinda wonder when we're supposed to charge it.
I already keep a charger at my work desk to charge my phone, that's when I would charge it and it would not be a hassle in the least.