well…Ive used/worked with balance balls and Balimo chair/stool (I thought it was called a stool ???) and Ive sat on other such purpose-created equipment, like the Gaiam Balance Ball Chair
http://www.outlettrail.com/store/product.php?productid=7051
and Ive ridden a fair amount of horses over the years<g>…
…and I think it may come down to WHY one wants to use the equipment.
The Balimo is very good to teach someone to ‘stack’ their head and spine over the pelvis, and allows for a practitioner to put hands-on to help guide the body and create new ‘muscle memory’.
The Balimo is also useful to isolate the pelvis, the hips, and create a range of motion.
The balance balls are good for better simulation of how the horse feels under the rider, and definitely better for how to use thighs and hips to create direction as well as balance.
All the equipment is rather like learning to drive a car in an empty parking lot–a necessary step for most people who do not grow up on a farm or whatever, where as soon as their feet reach the pedals, they have to drive equipment from one spot to the next. (ie, horse world where children are thrown on to ponies/horses and sort of figure out the rudiments).
Eventually, the car must be driven in the real world–other cars, bad drivers, lights, pedestrians,etc etc.
Same with the horses in the real world-- motion plus other brain plus reaction to outside stimuli plus power plus speed etc etc etc.
What can really be fun is to have someone use the equipment and then yell commands at them and see how quickjly they can react. Still not the same as the horse’s own reactions, but better than nothing.
LOL