Same here. My battery usage seems very minimal. I've had mine on for an hour now and it's only dropped 1%. But I don't think my notifications are working. Mostly because I haven't seen any yet. I know Facebook notifications are not working. I set everything up to mirror my phone and double checked the settings. Should be working. I might need to re-pair...
Waiting for my extra charging cables to show up today. I plan on having one at home, one at work and an additional one for traveling or just to keep in my living room.
Make sure the iPhone is locked to test the notifications... That is one of the things i love most about the Watch/iPhone intergration. If you get the notification on the iPhone when its unlocked it does not also go to the Watch. It made me crazy with all of the other smart watches I had that everything would go off at once!