It is a great watch but initially was a little complicated to add downloaded modifications

Love my watch right out of the box and have since added HRM-Tri to add even more information for tracking performance.

Just a great do it all watch that is not a Apple watch

The rate of decline slows as the power drops, but I estimate you can guarantee a solid 16 hours in full sport-mode (It lasts like 2 weeks in watch mode, which it automatically reverts to when you stop an activity)