I guess the recent apps with the swipe isn't bad. I've used it quite a bit today, actually. What's nice is the app suggestions presented at the bottom when you enter recent apps. If that really learns to suggest the proper app I'm looking for at a given time under given circumstances, that could be nice. Still not sure I like the extended or double swipe to open the full app drawer, but my most used apps have a place on one of my homescreens, so I guess it's not so bad for apps I only use on occasion. It would be cleaner, imo, for the longer swipe that opens the app drawer to not temporarily show the recent apps, but I suppose that would cause a slight lag in opening recent apps as it waits to see if you're going to swipe a bit more to get the app drawer. Also, I wish they'd tweak the flick to the right for the next app on your recents list. I do swap back & forth between a couple apps sometimes. Double tapping the old recents button to pop back & forth was nice. I thought that's what flicking the home button to the right would do, but it cycles through all of your recent apps one at a time.
The big thing I'm still not sure on is moving the clock to the left of the notification bar. I've been an Android user since the G1 in 2008. That whole time, my clock has been in the upper right. What's worse than glancing to the right of my XL screen for the time & not getting it is catching the clock out of the corner of my eye on the left & thinking it's a notification.
One little touch that I do like is the battery percentage shows at the bottom middle in ambient display. I don't care for the percentage to show next to the battery icon all the time, so that's a nice feature for me to get a quick glance at exactly where the battery is without having it clog up my notification bar with one more "icon".
Other than that, the beta seems pretty darn polished. I haven't noticed anything that I'd really call a bug in my first day.
Can't really say much about battery life because I had an atypical day today. Didn't seem to be any worse than I expected though.
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