I recently started using this at level 80+ and was impressed.. I was running Damage role on priest and it ran, nearly all dungeons, successfully.
I got to 84 and decided to switch over to healing.. so here is some feedback on my experience.
Issues:
Aggro from untargetable mobs causes the bot to run to tank although its not being attacked by anything. (This was in the MOP dungeon where a bunch of guys were cheering and mobs would come out and these mobs were preforming whirlwind as well!).
When tanks are doing a line of sight pull the bot should be behind him.. checking the first X amount of monsters against line of sight of tank could determine if its a LOS pull.. (Stormstout Brewery on last boss where mobs appear in the middle, especially the one part where there is 9+ ranged mobs)
Most of the time the bot runs great when the group is continuously moving.. however when there is a lot of down time the bot becomes very noticeable whenever little movements from the tank is occurring. At one point the tank was on an elevator and jumped off.. the bot went up but then started pathing back but through unaggroed mobs..
The bot also does not check when moving back thru a dungeon if the path has unpulled mobs.. it pulled and died multiple times when attempting to move back to the group after a death occurred. (A circle which had two routes, one cleared and the other not, and it choose the deadly way)
Also the bot would still DPS monsters even tho the settings clearly stated it shouldn't be.. (Mana/Health didn't work nor did setting the allow DPS to false).
Lastly, I noticed another bot while observing mine.. clear signs were that it was moving exactly the same position as my bot was.. was literally on the other guy and we were moving together and stopping together.. (was kinda funny

) but maybe some randomized movement would help? (not necessary just an opinion!)
Overall, a great project and enjoyed it.. although I'll be sticking to damage roles only from now on!