I'm very satisfied with the battery life of my HTC One. I use it quite a bit during the day (a few sessions of Duolingo per day, HN frequently, the odd email/chat, etc) and it's still at 40-50% at night (I charge it anyway when I'm asleep, though).

It's currently been on battery for 18 hours and it's still at 23%, and this includes listening to audiobooks for an hour in the car, etc. It's pretty great.