Update (11/25/11): I've now had well over a week to test the battery life on the Galaxy Nexus, and I'm pleased to say the results are better than expected. On a typical day of heavy use (phone calls, lots of email, Twitter, general productivity tasks) I'm more than able to go through my entire workday. Squeezing out 19 hours or more on a single charge is not uncommon. Some days, that number is shortened if I'm watching video, taking more calls than usual, or playing games, but it's no more dramatic a dip than you might see on any other smartphone. In using the device as my daily driver, I haven't found any major issues with battery life which would I would consider show-stopping.
As far as phone performance is concerned, however, the Galaxy Nexus feels blazingly, stupidly fast to me. Touch response is excellent on the phone — everything reacts quickly to your movements. Homescreen scrolling was snappy, moving into and out of apps was instantaneous, swiping through long lists was stutter free, and web browsing (even on heavy pages like ours) was super speedy. Game frame rates were smooth, photo viewing and editing was frictionless, and the phone handled heavy multitasking with aplomb. It's obviously a combination of great hardware and great software, but the Nexus is probably the tightest feeling, snappiest Android phone I've ever used. It's awesome.
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