No problems here either, I usually end a day with better than 50% remaining. My typical use is lots of txt notifications and voice to text replies, email notification and either deleting or archiving upon notification, using the Runkeeper app with interval notifications every few minutes for about 45 minutes, and lots of misc time checking and other notifications. I don't use the health app to track activities, just the passive stuff it does.
Good battery here too. Been using it for past few days with just a charge overnight. I cycle 25 mins to work and same home and a 10 or 15 min indoor cycle in the gym and I'm getting to 30% at night. Very happy with the batt performance. And that's also using the notifications on the watch quite a bit as well as taking my HR a few times a day.
I had a horrible battery day today, never had this happen before. Normally I don't even pay attention to the battery since I still have around 30-40% left by her time.
But today I woke up at ~4am, and my watch just died completely around 2:35pm. Not even 12 hours! Normal usage as far as I know (haven't even gone to work out yet). I'm guessing something was just going on in the background, like loading apps or transferring pictures or something. I'll check the Usage page in settings when I get home.