So far @OGroteKoning my honest opinion and this is coming from a Note2, Galaxy S3 and a Galaxy S4 is that the UI of this Nexus is amazing its so clean, so snappy and really well put together I love it. The new white and smooth fading of kitkat is awesome, Screen is beautiful really stunning along with the crisp interface they fit like a glove.
Overall my build of my nexus is wonderful power and volume buttons are pretty fixed in place not loose like reviews say they actually feel better than my s3 and 4 did.
The device is definatly the snappiest iv ever played with for one. As for battery i cannot report thus far as I unboxed it yesterday and had it on the usb cable charging while i loaded up my pictures and apps and what not. Then had it on and off and forgot to put it to charge full over night. Ill charge it tonight fully and Ill have a real world test tomorrow when im out and about and its on the car bluetooth and all that stuff. It has all my apps on it already so shall definably report for you.
Overall this device is so quick and i dont know if its just me but im really really amazed at the sleekness of the UI and the device. Something about it that im just mad about.