That is on interesting about face there Cherie, "from nothing good to say", to "Glad there is a use for them" Just wondering if you have ever used the system yourself?
I haven't but I'm seriously considering investing, because the more research I'm doing I'm hearing more good things about this type of system. A lot of people have been recommended them for horses recovering from injury or time off because it is not a gadget to try and force a headset, but more to encourage the horse to work from back to front, and by that improve the muscle tone along the back and neck.
I am just about convinced, but still scared by the price
OP, I don't know if it would work on a nose band, but the idea isn't to put pressure on the horses mouth with this device, it is to try and teach self carriage, so they are very softly on the bit, not leaning into it, and not behind. If it prevented loose rein work afterwards it would not be as popular as it is I think.
Again, merely opinions from research I have done so far, I have never actually used one yet.