[citation][nom]amdwilliam1985[/nom]I'm more interest in the battery life, seems like JB increases a lot of UI performance, but at what cost though? Does the battery life take a hit?It'll be great if we can increase UI smoothness without significant cost of battery, I'll upgrade to JB in a heart beat. But I value battery life > "smoothness".I thought they're giving out Galaxy Nexus preinstalled with JB at Google IO, can't someone run the battery life against the "old" Galaxy Nexus on ICS.[/citation]
I installed the JB ROM on my VZW Nexus, and I'm not noticing much of a difference so far (it was pretty terrible on 4.0.4). We'll have to wait for conclusive tests to determine the real draw on battery.
Some things will inherently draw more battery - Google Now is great, but to get the maximum utility the GPS needs to be left on so it can recommend Places literally right next to you.
The experience overall is significantly smoother than ICS was, so I'm looking forward to the actual release and the tweaks in the incremental updates.
In regards to the Nexus 7 - this is an amazing tablet. It does more than the Fire does, and the only thing it can't do is Amazon Instant Streaming (which in reality is basically Netflix's library). I owned a Fire and though it was a huge letdown from day 1; ended up with the Nook Tablet and felt the device and OS were much better crafted, just lacking in content.