I like GIK also. In my room the corners have quite a bit of bass build up that is easy to hear by walking along the walls.The corners where the walls meet the ceiling were the most critical areas to treat.
Room treatments for a lively sounding room
I recently remodelled my 10 x 15 listening room as well as the adjacent room it is open to. New paint and hardwood floors now instead of carpet. The room sounded to "shouty in the midrange". I bought a large area rug for the room but the room was still too "lively" sounding. Tried putting a blanket on the side wall not adjacent to the open room. Sounded much better, but unattractive. So just I installed a multi panel room treatment kit from Primacoustic last night. I was just curious what other members of this forum have used and what room treatment experiences have worked best for them.