Used a Nexus 10 for a day.
Design, though plastic, felt well built. Screen was very stunning. I even liked the Android UI (even though the clock app kept failing).
The one thing that stopped me from loving it: The touch screen responsiveness.
It had Project Butter, but there was still a noticeable lag compared to using an iPhone or iPad. It made navigating through the UI feel much more unintuitive.
Apple is the only company that has their touch screen responsiveness down perfectly.