I am always keen to watch Gav's videos, he confirms it is an excellent option for upwind downwind which I think is the most important aspect of parawinging.
He does complain about the tips collapsing when really overpowered. Is this really a negative or is there some positive to that? On my flow Dwing the tips collapse when you get overpowered but the wing stays controllable. It actually allows you to use it in really overpowered conditions. The tip collapse allows the wing to spill power but most of the leading edge keeps its shape and remains controllable. If a parawing collapses from the center of the leading edge first, like the v1 BRM, it becomes completely uncontrollable.
Now using my 4.2 Dwing in really overpowered conditions is messy and unpleasant with the tips flapping all about but it is manageable. We would all love a solid clean canopy in all conditions but everything has its limits. I think a wing that collapses tips first actually has a higher useable top end than something that collapses from the center of the leading edge first.
Ofcourse these are just my thoughts in general and can't relate them to how the naish hatch performs specifically. ( unless windgenuity wants to send me one to try out

)