I've got a 38mm AW Sport running 2.2.2. I typically wear it about 15 hours/day (after charging nightly) and end the day at about 30%. I do 20-30 minute workouts every other day or so, and try to mimimize battery drain with simpler watch faces and few glances running in the background. I've had the watch for about 5 weeks and I'd say I'm satisfied...although a better battery would certainly be welcomed!