Very quick first impressions:
1. Screen has really nice color compared to my Galaxy Nexus but very slight pixelation which I don't notice on the GNex
2. Screen is a bit more sensitive to touch, so sometimes you hold on an icon to move it and it opens instead. Also, with the edge-to-edge display you can hit the screen on the sides every so often opening an unwanted app. I have a feeling it won't take more than a day or two to get used to that and it shouldn't be an issue.
3. At least with the car charger that I have, when streaming audio through Pandora or Slacker with the phone charging through the cigarette lighter I was getting really bad interference. Luckily my car has a direct USB input and I can charge it via USB while using the auxiliary plug and it didn't exhibit the same behavior.
4. Quadrant standard tests were 4800-4900, which seems to be really good. I think when the JB update comes through it will be REALLY smooth because it's not quite as smooth with transitions and scrolling as my GNex running JB.
I will try to post more later.