I think there's a tripleboxer on alliance doing warlock priest and I think warrior, saw a recently new guy appear fiveboxing shaman lowbies, just before I let my account time run out early April. Got two guildmates to try it but they were too cheap to continue, and I don't really have the budget to triplebox.

Bonus video: My solo hunter alt in AV demonstrating how fun engineering is - http://www.dailymotion.com/Mamiya645...y-w_videogames (basic video of clips put together one by one)