In my younger days, I used to be a proficient hang glider pilot. Like bicycles, these devices are made to be inherently meta-stable and therefore require constant body input to operate. I realized that crash from the air was deadly, so I sold the glider and got out of it. Then I got into cycling which is much safer, provided I cycle on the bike path and don't go at high speed. Under such operating conditions, I feel that cruzbikes are really safe because both of my feet can instantly touch the ground. On a steep down hill, I would apply rear brake intermittently; even on a V20 with its handlebar far up front, I can always sit upright and both feet off the pedals, then, I feel the bike is a lot more stable than a typical DF road bike.
MBB bikes have front wheel flop problem. I would like to say that the wheel flop is not what it mentioned in the literature: flop factor = trail x sin(A) x cos(A), where A=head tube angle; this is based on the false assumption that the front tire touches the ground at single point. In reality, for larger wheel diameter and less air pressure in the tire, front tire makes contact with the ground at quite long patch, that would nullify 10 to 20mm of flop factor. In MBB bike, even with A = 90 degrees, front wheel flop is due to asymmetrical mass distribution with respect to the steering axis, i.e., crank, chain rings, chain, chain stays, and boom, etc. (edit: sorry, I mean the boom, the frontal section of the cruzbike type of steering column.)