> These are primarily diffusers of a curved design, very secondarily diffractors, minimally resonators and absorbers. <
I guess my main objection, if that's even the right word here, is they are too small to do much useful. When you see diffusors in a professional million dollar recording studio, large areas of wall and / or ceiling are covered. Not just a couple of narrow strips, equivalent to3b38ew of these lens thingies.
--Ethan