check out the thread below. Lots of people with ATT have switched to either a French rom or Rogers rom (myself). I have no battery or connection issues.
Some people have reported stability and connection issues with the ATT dev rom, issues that disappeared after switching to the Rogers rom. With the correct settings you could get tethering on a non-tethering plan with the French rom. I flashed with the Rogers Amber/GDR2 rom and now have data sense, fm radio and all the other extras that come with it. tethering does not work. However, I am on a plan that does not include tethering anyways. I am using Tether-X for that.
I personally decided to stick with a rom that matches the radio bands of my service (e.g. LTE will show up as LTE on the Rogers (RM-820) , while this will be different on the French rom (RM-821) ). All the details are here:
http://forums.windowscentral.com/nok...-features.html