I have used GIK on a number of occasions including recently for an art panel. I ordered it on Jan 1 and it just arrived today. Frankly I was pretty disappointed in the slow service.
A few weeks ago, I decided to try some QRD diffusor panels from ATS Acoustics since I felt that the absorber/diffusor panels (Impression Pro Series Bass Trap Diffusor/Absorber) I had purchased from GIK were sapping too much energy out of the music.
My ceilings are a couple inches lower than 8ft, and I wanted to do floor to ceiling diffusors. GIK doesn't seem to offer custom sizes like this, so I searched around for alternatives and found ATS. For a small upcharge, they were willing to do a custom height.
I ordered eight custom sized diffusors from ATS and they arrived at my door literally eight days later, and that includes shipping half way across the country.
Unfortunately, one of them was damaged in shipping. I contacted ATS and a replacement arrived a week later at no charge. Kudos for the exceptional customer service!
They are well made and sound fabulous. You can see them on my virtual system page. jaytor's system