I have the 60" Meadow Creek. It was the biggest size that didn't come on it's own trailer. I wanted to have a lot of capacity in case I get to the point where I want to start doing some amateur competitions here and there, but if it was a trailer unit I wouldn't be able to get it through my gate into the backyard. Fits nicely into the bed of a pickup truck when I want to transport it, you just need 3 guys to muscle it up there. The thing is a charcoal hog though. Looking at a minimum of 40lbs of lump charcoal to get it cooking, then whatever wood you want to cook with on top of it.
WSM's are great. I don't think I have ever heard anybody say a negative thing about them.