I have a couple of 10-box teams that I've enjoyed taking into Naxx. Multiple classes take a few hours to set up, but the benefits FAR outweigh the time cost. You spend, what? a week or two of /played time leveling a team from 0-80? For another 5-8 hours investment getting everything set up you can get optimal talent specs, glyphs, and macros written for each class and then have a much better experience.

My Naxx Experiences