I have ten GIK panels. I waited between 6-12 weeks for them over the spring and summer. I almost canceled one or two sets, as I order them over a series of months.
But, I am super glad I was patient. You will be happy when you get them and place them appropriately.
I will say, it did take getting all them for things to really snap into place. But my space is a challenge and eliminating first reflections and other things was a huge improvement.
Go for it.