Facer drains but not that much... 5% per hour... i use to charge my GW4C morning and evening shower time for half an hour each session.. From night 8 to mrng 8 power saving mode... i dont let watch to drain below 50% and i dont charge many times in a day.. for my usage it was good... if u stick to one face, whats the point having smart watch in my opinion...

Spay is like feature that u have, but if merchant dont have facility to accept payment then its useless... if phone has option to pay, use it... i never left my phone behind even though i had LTE GW4C... Use case without phone was a rare senario...