Warning, at 5% into level 59, I was looking to just get 60 and go back to powerleveling AA's via SK harmshield/wiz AoE. I did one mission with my newbie box wizard and decided to pop LoTD and just quickly get lvl60. Well, my wizard went from 5% into 59, to level 63 on a single mission.
For AA's, it seems pretty fixed what you get per mission. You can quickly get from 0-100aa's with like 4 to 6 missions as the first 3 or 4 missions gets you 20aa's a pop, then drops to 18 or so as you near 100. Stays in the teens just over 200aa's I think, not sure, but around 300aa's you're looking at 7 to 9 aa's a mission. Once over 400, it's about 5aa's a mission. Not sure when it drops to 2aa's a missions, but my character with 1300+ only gets 2aa's a pop.