If you want to monitor sleep with it charging at night isn't possible, and remembering to charge every single day during the day is annoying in my opinion. Not everyone wants sleep monitoring though, or likes to sleep with a watch on, so I get why there's some division on the subject.

My pebble 2 hr lasts about 5 days and I'm very happy with that frequency of charging. I think it was a bit better when new but that was a long time ago.