I am also very happy to have found this thread among all the complaints on the other one! Thank you, thank you!
I did the update the day it came out. Then yesterday I did the hard reset. (I also didn't see the choice "as new iPhone" but went ahead anyway). Then I let the battery drain. I have to say that the last 1% took forever ironically enough. I recharged overnight to 100% and definitely noticed a difference today. I'm currently at 37% with 4 hrs usage and 13 hrs 21 min standby. I'm fine with charging overnight each night.
I did see the percent drop a few points when I was writing a lengthy email.
Some additional comments:
I hadn't really noticed a big battery problem initially but this is my first iPhone. But I hadn't enabled wifi syncing with iTunes originally. I was able to set up and activate without connecting to the PC. I hadn't been interested in syncing my music to my phone since I still have my Nano. Well, last week I did connect to the PC to charge which made the connection and I wonder whether that had any impact? I have not enabled since the reset.
Also, I saw someone post about Exchange accounts. I deleted my work Exchange email account before the reset and haven't yet added it back. I'm a little nervous about it. But I have turned off "push" and set "fetch" at hourly.
I also have an original iPad and this weekend for the first time it only said 96% after charging overnight. I haven't noticed a difference in its battery life though so far.
I think that's it! Thanks again!