I can only go by what I have learned via my rolfer, going to yoga, and in general having an acute body awareness, as far as where the various parts of my body are taking up space, and if all the parts are in the proper position to function properly.
A couple of years back, I considered getting those shoes. I actually bought them. (then immediatley returned them after learning the truth)
At the store I put them on, and yes, they do cause your body to stand straighter, feel balanced.
I took them to my rolfer, and she immediately nixed them, and with, now I can see, very good cause.
Sandy (my rolfer), has said on more than one occassion "The worst thing parents do to their children in their learning to walk and move about is putting shoes on their feet."
Our foot, in it's natural state, is supposed to be supple, flexibe and strong. Our big toe is the major hinge that flexes as we move our body forward past our center of gravity. As we move forward, the purpose of our big toe is to, with a good amount of force, propel our body through space, enabling our hips to swivel freely, our knees to flex and absorb, our back to remain erect yet subtle.
Walking is a very interactive and complicated activity, and it all starts with a foot that is able to navigate uneven terrain by bending, flexing, minutely changing our balance microsecond to microsecond. We think of walking of plodding one foot in front of the other, but it's really not.
What you want to wear on your feet are shoes that best simulate walking barefoot. The more flexible the sole the better. You've got to let your foot do its job, and grow stronger, and use things like massage and facia release to get them as open and flexible as possible.
These toning shoes are prisons for your feet. The soles are thick and do not flex. While the rolling action you get when you walk in them feels good, really good, this is something your foot is supposed to be doing, not the shoe. When wearing them, your foot is not moving much, you're rolling forward only because the sole of the shoe rocks you forward.
Better to go get body work done so that your foot is able to perform what this shoe is trying to simulate, which is the foots normal function.