Grabbed an HTC One a few weeks back and I love the phone. I gave the battery some time to get some cycles and condition itself. Still, I'm not getting great battery life. I'm not a power user by any means but I can't get the phone to last through the day and if it can't do that, I can't use it.
I'm about to read through all the 680++ posts here, because that seems to be the only way to make sure that a small tip or trick buried somewhere in the thread might be the one I need. I just wanted to say that now that the thread has grown to this size, if one of you serious HTC One experts wanted to make a sticky with a summary of the major tips and tricks that have been revealed in this thread, it would be really helpful.