I'm almost finished with the (shortened) 14 day Samsung Galaxy Nexus Challenge, and thankfully, Samsung was nice enough to replace my demo unit with another one.  Still, I'm dealing with some radio issues that shouldn't be there, and the battery life hasn't improved very much.  I don't plan on keeping it when the 14 day challenge is over, despite really enjoying some things about the build quality, 4G LTE on Verizon, and of course, stock Ice Cream Sandwich (Android 4.0).  Stay tuned for my final thoughts on the Samsung Galaxy Nexus!