It doesn't really do anything the other two don't. The bid difference that I think people are trying to state is that no one really uses any of those other features. Not really.

Pebble gives you notifications, time ... new ones give you heart rate monitors (I think?). You don't get those other features no one else cares about, but you do get like five days of battery life.

I'm still on my Pebble Steel and I still really like it. I even saw one in a retail store in Ireland today. Was kinda weird.