I'm getting two days out of my battery without really trying. Mind you, at the end of two days, it's gasping for breath and screaming at me to charge it. I think now that it's "settled" through a couple of full drain/charge cycles, I can get into a pattern of leaving it in power saver mode for most of the day, and turning it off whenever I'm sitting down for a "session" like lunch, where I dig through the news and the Chive and such. Bet I can get three days out of it, then. And that's stock ROM, it'll probably get to crazy levels once I get a new ROM on it.
Speaking of which, there's rumors that the One may be getting a "Nexus version" as well that runs stock Android without Sense. That means a fully-functional stock Android ROM will be available for the rest of us. Let the devs play with that for a couple weeks and I'll never need another ROM again.
I figured out today that the standard "notifications" doesn't apply to Messages, it has its own completely separate settings within the Messages app itself. So I got a text this morning that bleated out a completely different sound than what I had thought I had set it for. It also has separate options for vibration and such.
As for the flashing LED.. no way to change it, at least in stock ROM. I haven't loaded anything else yet, so I can't say for sure if the other ROMs will let you turn that off.