I currently have used KitKat on the Nexus 4, Nexus 5, and both generations of the Nexus 7. KitKat is a great step forward and I love it.
Nexus 4 - 8/10
I give credit to Google for not changing the launcher and giving the unsuspecting user a jolting surprise. Now I don't understand why no official option has been given to enable the new launcher. The Nexus 4 is entirely capable of running it so why couldn't there be an app I install or a switch a flip to give me the best KitKat has to offer. On top of that the default launcher doesn't support transparent notification and location bars. The net result is you don't even notice you updated.
Nexus 7s - 9/10
KitKat runs great on both generations of the Nexus 7, but again the launcher fails to take advantage of KitKat features that these tablets are completely capable of using.
Nexus 5 - 9.5/10
KitKat on the Nexus 5 is the most beautiful Android experience I have had in three years of Android use. Everything happens immediately. Lag is gone. It is stable. After my initial setup of the phone its first reboot came over three weeks later when I installed the 4.4.1 update, and even today it runs rock solid. The camera app is in need of update and not quite as stellar as they lead you to believe, although it is good enough.
KitKat Overall - 9/10
It has a lot of great improvements but it doesn't solve many issues. The number one issue in my mind is the app switcher. On the Nexus 5 the app switcher is almost instant. I can literally tap the button then tap the app all in under a second. On the rest of my devices, including the second generation Nexus 7, there is a very noticeable delay. If you're going to say this will run on low end devices then make sure it runs perfectly on any current top end hardware.
Posted via Android Central App