Has anyone else enabled ART on their Nexus 5 (or other phone running a build of KitKat)? I did so after I rooted it yesterday because... well, it was there. So far, no issues, even on a rooted phone. Apparently some rooted apps and other apps like WhatsApp have issues as well. However, I've seen no problems, and you can revert. ART promises great things. So far, the N5 is so wicked fast I can't tell if it's better, and it's so new, I can't tell if the battery is lasting longer. But it's sorta cool to be able to alter the way the device runs apps at a fundamental level.