looks neat, but this would stop my buy:

""" Use USB charging for the heart rate monitor, step tracker and notifications. Time display is powered by solar charging alone when the battery runs low. """

I have a gshock already (GM-B2100D-1A) and I love it - I especially love that it should never be opened, always just works, and it looks ok too (:

I think it's nice that the watch falls back to effectively unlimited watch-mode instead of shutting down completely because the heart-rate tracker ate up all the battery.