I have been on 4.4.4 Kit kat for almost a week now and just finally brought back to my nexus 7 2012 (wifi edition) with it and so far I have been pleased. But just because I am not having any issues do not mean hey do not exist. An article from GottaBeMobile (Android 4.4.4 KitKat Problems Plaguing Nexus Users) discusses the issues Nexus devices (nexus 4,5,7, and 10) are having with certain apps such as iPlayer and BBC (apps I do not personally use). There are a list of other complaints seen here (https://productforums.google.com/forum/#!topicsearchin/nexus/android$204.4.4%7Csort:relevance/nexus/B-tfSsWXN-c), but so far I have not experienced any issues personally. Those with Nexus devices what issues have you noticed since updating to 4.4.4 KK.