There is a LOT of work being done on AM right now behind the scenes. Lots of really good stuff in the works for it... well, for an offshoot called AttractMode Plus. Stay tuned on that.
That said, custom compiling AM will get a few extra benefits like MMAL hardware acceleration. At some point that wasn't part of the experimental install. Don't know if that has changed or not. That is handy for better video processing of snaps. Anyway, if you plan to try that, make a backup of your image first. I've got instructions floating around if anyone wants to try it.