Did the tour today.
We got to see the 747-800 Cargo, 777 and 787 Assembly lines (from the gallery only, of course).
Very cool, and there was some sort of vintage airshow going on at the same time, so I got to walk around a Catalina, a P-51 and assorted other warbirds ^
Would definitely do this again, and maybe combine it with the Boeing Field tour as well. @:-)