Nexus 5 owners. Has anyone tried ART?

I am wondering if anyone tried the new experimental ART run time on their Nexus 5. I heard about it yesterday, but AP just did a write up on what exactly the thing does.

http://www.androidpolice.com/2013/11/06/meet-art-part-1-the-new-super-fast-android-runtime-google-has-been-working-on-in-secret-for-over-2-years-debuts-in-kitkat/