GIK: I found them to be pretty helpful in offering some real acoustic advice and actually in my earlier years helped explain some concepts. I think it was Brian (could be wrong name) who explained what is possible and not in one of my rooms. At least it set me on a better understanding that I later read and learned some more from.
I use their panels in my studio with the membrane absorbers and they do work better than standard DIY Rock wool types.
As I am not a fanboy of anyone I try to keep open minded and find it interesting what is show by the OP. Surprised Glenn from GIK didn't comment in hear as normally they have addressed concerns in the past that I also would like to see cleared up.