I also have GIK panels as well as DIY for my 2 channel system and home recording studio. I can't tell you how many times I see pictures of nice stereo systems in rooms that look like they'd have terrible acoustics. I realize because of WAF (wife acceptance factor for those who don't know), not everyone can do much about it, but even just a handful of removable panels can do wonders for the sound. If you're not using any, you're doing a great injustice to your ears.