Ha! I haven't but now I'm half tempted to go out and track down rotational inertia formulae and figure out what the exact difference is.

Bigger wheels roll over bigger stuff. This was one of the big advantages of the ordinary over the boneshaker. It took Dunlop's pneumatic tire to bring us back to relatively small, equal-sized wheels without rattling our teeth loose.

Some 26" frames can fit 29" wheels. Case in point: the Surly 1x1. I've done some looking at my MB-2 and I think it might work too, but I'm not particularly interested except in an idle "I wonder" sort of way. It messes with the standover height and handling and you need to change up your brakes (there are canti extenders or you can go disc if you have a discable frame).