Never heard of them but just googled and it looks very interesting.
Will follow this with much interest as have had something of a lightbulb moment today with regards to why my mare is so difficult to fit a saddle to. A device like this would be perfect for testing my theory!!
No, I teach, mainly confidence, but my aim is for people to have fun with their horses, whatever their goal.
The thing is, a lot of people who come to me with "confidence issues" actually have horses who are uncomfortable, and give an unsettled vibe to the rider. Others have gaps in their knowledge or skills, and so misinterpret what is happening.
My previous background was in training Police horses and riders, as well as competing my own horses.
I've used one and it affected the fit so much as to make the results totally null and void. It's very thick and very unstable on wide flatter backs, might be better on higher withers or narrower shapes but I'd save my money personally.