First impressions, such that they are. Screen is fine in sunlight. The contrast is a little bad, but potentially because I'm so focused on it. Nothing you would notice in a vacuum.
can't speak to the battery, obviously, but I just spent an hour with the screen on downloading all of my apps, and the phone didn't get overly hot. Not really hot at all. Just a bit near the top of the phone, near the camera lens, but not nearly as hot as my other phones. This was in the air conditioned store, fwiw.
In limited typing, I like SwiftKey better, but I want to give it a shot.
The customizable options are crazy, and I'm finding a lot of them useful.
I didn't notice any lag, but I'm switching to ART as we speak. Going on 10 minutes and about a third finished. On the charger and still not hot.