I used that Bay Bloor "wall of headphones" for about 1 hour one day. It was excellent. (Not sure if it's still there).
I purchased my Grado SR-125 headphones there. The sale price they had was close to prices elsewhere, and since I'd made extensive use of their facility, I thought I'd buy there, rather than run around to save a few $. I believe they were about $200.
I tried every headphone on the wall and the only ones that sounded better than the SR-125s to me were another Grado set that were over $500...
I actually went looking for wireless, but when I tried them and walked around the room, the sound was inferior and the sound dropped out whenever I got a "ways" from the "sending unit". I stuck with the wired set.