Got a Bogner 4x12 and a Mills. Mills didn't do much for me over any other cab.
Port City has a good idea with bringing the sound forward from the rear of the cab. Has anyone ever cut a hole in a 4x12 and mic'd the rear of an enclosed cab? I would be real curious and may cut a hole in the Mills to give it a try and seal it around the mic. I know that Munkey from Korn does this with one of his Mesa cabs. Not that I would want to emulate Korn or Munkey - but the idea seems reasonable.
Steve