Also a Panda Monk, Brewmaster spec and planning to tank through dungeons to level up. I'd previously tanked a bit on my DK which I enjoyed. Also had a Paladin but I didn't like tanking on that.
Just hit level 20 last night, haven't been playing him much since I want my main to 90.
Got the head, chest and shoulder Heirlooms at the minute, so that's 30% extra xp (then there's the Monk specific +50% xp once you get the Pilgrimage spell). After getting my main to 85 I didn't want to level another character "clean".
In the dungeon runs I've done the first group were all Pandaren (Four Monks, One Warrior). The second was 4 Pandaren and 1 Dwarf.