I didn't pick it up until around 5.3. After that I leveled up a few pets, most in the mid to upper teens now, with my highest lvl at 19. I've not messed around with it in about 3 months though. Life happened and even though it was fun there are other things for me to worry about now. Raiding is first priority for my WoW time at the the moment, that and VP capping. Thats 6 hours of game play a week and I don't have much time for must else these days.