Hate the look of the new OS, their goofy window transitions look choppy, battery life is roughly 2/3 of what it used to be (just checking email and Facebook, I can barely get through a work day).
When it comes time for me to upgrade after my two years (I can't be that far out), I'm ditching it. The only benefit is that it will run several apps on the DVD player in my truck, so it can interface with Pandora and Waze, but I think I can at least stream Pandora with a Samsung or equivalent through aux input or USB.