You will probably get a lot of stories about how awful it is. But don't worry about it. There are 2 critical things to remember.
1. This thing has a HUGE screen. Big screens use a lot of juice....especially when you can't keep from looking at it. Keep the brightness dialed down for best results. I wouldn't go any higher than 30% and I keep it at 10% which is fine except in direct sunlight.
2. 4G chews up battery. Don't let anyone tell you any different. Its a fact. Until phones start coming with hybrid 3G/4G chips, the bottom line is 4G uses more power even though its supposed to be more efficient. Keep in mind these are still essentially 1st generation. If you don't need the speed and value battery life, consider using 3G. Also, ALWAYS use WIFI whenever possible. Wifi uses far less juice.
Finally, there are some bugs that are causing drain for a lot of users. Personally, I have found that turning off unnecessary sync services has addressed most of those problems. Google+, photos, and separately google backup were problems for me. I only sync gmail, contacts, calendar and browser. Things like twitter and facebook I have no need to constantly see updates (well, I quit facebook actually) so they are not set to sync.
Personally, with those tweaks I typically unplug the phone around 8am at 100% (well 99% technically most days).
I use about 2hrs of screen on time (which is a major factor in battery life)
Maybe 20 minutes of voice calls (don't forget phone calls use lots of juice)
80-90% of the day on wifi
at 11pm when I plug back in I am usually still over 30% on the battery. More if I don't stream anything on Sirius or Google music.
I am rooted, but stock kernel, stock rom.
