If there are people who have explored the GIK acoustics products range and used it in their system, I would love to have a chat with you. Do send me a PM. Thanks for your time.
I too once saw GIK products for use in my stereo room, after looking at the prices I decided to make my own 23 prime QRD diffusers in my workshop. It took some time and effort to study how it all works, but I ended up saving a ton of money and attain valuable experience along the way.