I finished up last night. Level 82, ~73 hours. At that level, I found the final boss to be a bit of a breeze. My party consisted of Shulk, Dunban, and Riki.
Re: coolz481's post, I was level 74 or thereabouts at that point. Worst dungeon of the game, due to its narrow platforms, large enemies, and a propensity to fall into the ether lake below. Not fun.