For those who say AOD has a detrimental effect on battery, what do you mean?
I have S7 and it's my first watch, bought about 21 months ago, so maybe it's still too early for me to see some really negative effect. My battery health seems awful (85%) but I still get more than 24 hours for now
It uses more battery power to have the screen on rather than off. That in turn puts more "life" on the battery, which has a limited life.