I had no problems adjusting them on snow.
Yes, they way more then a regular jester, but compare them to another 16 din binding and they really are not that heavy.
As for flex, its actually not as much as you would think. the connecting cables/device is not rigid, it can flex a bit, No the ski will not flex like it did on the wall, but your boot will actually do more to kill the flex of the ski then the schizo will (depending on forward pressure).
As far as the flaws go, I think being able to adjust your mount point more then makes up for the few disadvantages of the binding. Putting it on ski like the Fujas or Jeronimo will allow you to have one ski for park riding and big mountain skiing. So really your saving the cost of a pair of skis and bindings. I would say thats a win.