Tested with a Canon EOS 550D and EOS 5D Mark II with Zeiss lenses 21mm F / 2.8 and Zeiss 35mm f / 1.4.
The two boxes were tested with and without grip.
In any case, I had no problem adjusting to the "Matte Box" (Visor).
By against the "Follow Focus" is unusable if a grip is mounted beneath the case. The weight of this "Follow Focus" is 350 grams, this is one more reason not to
mount it and use it. Personally, my goals (to film) being textbooks and using Magic Lantern, it does not ask me MAP adjustment problem.
My tests were held at home, I have yet to test it on the ground and this is another story.
The storage in a suitcase and fast implementation on the ground remains to be tested.