I also had ART set on my Droid Maxx. I did notice slightly more snappy response. I can't speak to whether or not it saved battery. It certainly wasn't a huge difference if any, and it didn't hurt battery life. Beyond that it worked flawlessly. I never had any crashes or problems with app optimization.
On the Turbo, as doogald mentions, there is a glitch that keeps around 70 or so apps (on my phone) from being successfully optimized on ART. So every reboot results in a new attempt to optimize those apps. It makes for a much longer boot time, but once booted I haven't noticed any issues. I also haven't noticed the snappier response I noticed with the Maxx.
I say give it a try. You can always switch back if you want to. FWIW, my Turbo is set back to Dalvik.