I would most definitly would want a window on the panel. I am about to pull the trigger on this case and get one from memory express here in calgary. Right next door essentially is a place called Industrial paints and plastics which Im sure most of you now the place, they deal with a wide variety of plexiglass, acrylics and so on. Now I can mod the side panel and put something in it, like a 8" x 8" light grey acrylic or plexi that would blend in with the brushed aluminum, which imo would look awesome.
For a 350 dollar case, this shoulda came with this in the first place. I am building a new machine for Ivy Bridge, so far I have an asus 7970, 16 gb corsair ram, Corsair AX1200 psu, ssd's, cosmos 2 possibly tomorrow morning. Waiting on a brand new Asus ROG mobo with z77 chipset along with a 3770k, not to mention I have water cooling components from EKWB on the way. Now with a brand new machine, I want the ability to show off my new setup, show off my new wc components, I love love love the case, I think you guys have done a fantastic job at creating one of the best cases to date, but no side panel window??
In the future I would like the option of being able to buy the side panel with a window. I think it would be smart to not only have the cases come with a window but being able to support the people that may want one in the future that have already purchased a non window case. Not everyone can mod the side panels to install w/e they may want to, people may not have time, or the confidence to follow through.
Just my 2 cents.