I replaced some GIK panels with these to cover the reflection points from my speakers. Maybe the GIK are a bit better on absorption, but these look so much better, I don't mind the minimal difference. The hanging system is strange, as commented earlier. I don't understand why they did it so complicated, but it's stuck to the wall now. Not sure how to remove them, if that time comes. But, I guess it's more likely I will buy a few more, rather than getting rid of the ones that already are there. It's hard to find good looking acoustic panels, but these are just very stylish with their birch / cream-colored fabrics combo.