I ran android L, rooted with the Code Blue kernel for about 2 weeks. For me it ran great.. It was different and pretty cool to experience the next step forward in android, but I missed my Dirty Unicorns ROM.

As stated above there were some small bugs and actually for a preview it ran very well... That could of been partially due to Code Blue Kernel also.
I did also miss the Gallery APK, so I installed the OnePlus One CM11S gallery APK and it ran just fine and I actually like the OnePlus One Gallery.
If your still running the Android L preview you could try out the APK from here -
http://androidforums.com/nexus-5-all-things-root/847689-oneplus-one-cm-11s-camera-gallery-apk.html
It is different than the normal Gallery, but I think you would like it has a nice UI, easy to use and all around its pretty nice... I actually still have it installed next to my regular Gallery.