As someone very excited for this watch, the battery life with an always on display is more important to me than a sp02 sensor (Btw it will do sleep tracking). That and the button navigation are the killer features. The watch shows me what I need to know when I need to know it, always has the time on, and I can navigate it and control media playback without having to look at it (since buttons are consistent). I want a smart watch to be a good watch first then being smart is the second priority, and the pebble is the only watch I've ever had that gets those priorities right for me. Every other smart watch I've used sacrifices something I value to fit more features that I dont value as much. The pebbles have just gotten it right for me.

That said, the watch also isn't for everyone, and a lot of people are OK charging their watch every day if it means they also get every feature they want.