So far out the four hours I've done of it I've bumped myself to 21. Did go back down to 19 near the start after having no one rescue my hopeless self, so that was fun. (Bunnies led me to an area with a level 40 mob. Whoopsie.)
Atmosphere is nice, can't say I landed in many good groups though. Got kicked out of one of them for not applying a regen to the tank quick enough when he was at full health.