I have had experience of this since, well, before it's conception, actually!!
Sorry but for me it is a non-starter, as far as I am concerned if it isn't broken I am not going to try and fix it, and this thing addresses nothing in harness that is "broken"
Whereas the formed neck collars were an advance on the current breast collars, and made sense, this does not, not any part of it at all.
Neither the harness nor the vehicle get my approaval, I would far rather have a Hyperbike.