The battery drain is huge too.
When did you install it? And after the hard reset did you do a restore or no?
I did a restore, and noticed the battery drain was huge. However, I think what was happening was the applications I had on my phone prior to the upgrade were downloaded first from the old store and then again from the Store (Beta). Every time I looked at the Store, my "recently added" list was huge.
I didn't notice too much drain yesterday, but will check during the week.
I have been running it since Thursday night. Here is what I have seen -
After the apps have been re-downloaded, the responsiveness is on par with 8.1
I am not sure if the Push Notification for Outlook are working 100%
Some Band background communication issues re: notifications.
I am unable to add a picture to a contact in People Hub if they didn't have one before the upgrade.
The Quiet Hours in the Action Center is blinking.
Right now, all of the apps I need to work are working. Outlook, OneNote, etc. Haven't noticed too many apps not working. Some minor issues with Live Tiles for Calendar and Mail.
EDIT - Yes, there is more of a drain on the battery than 8.1.