I have the non-solar version of 6x pro. Deliberately chose this since the solar coating makes the watch face harder to read (it's not a bright watch). Unless you use GPS tracking heavily, the battery will easily last a week with normal watch functions (including calls, notifications, etc). It wears much bigger than the apple watch, so need pretty beefy wrists to pull it off. Also the standard rubber strap is pretty useless but you can buy a SS strap for it from Garmin specifically designed for this watch. I change watches all the time but this one I'm hanging on to - a very impressive piece of tech IMHO and extremely well made.