Too tight on the head or just awful sound quality? Just curious. I've heard from a couple people that found them too tight to be comfortable. Luckily my head is small I guess.
The UR-55 have a pretty good soundstage and some music just has an airy quality to it with them. Sure the songs aren't supposed to sound like that to begin with? I think it has a lot to do with the foam itself and I think this is how the headphone is meant to sound. I imagine some people will hate it. If you think that's bad, wait until you see the UR-40. That's a whole other story though and it's not a good feature. I kind of like the soundstage of the UR-55 despite not being really an open pair. On my Grado SR-80 the echo effect in some songs is completely gone until I try other headphones, especially open ones. It's strange. Never had the hollow effect with the UR-55s though, but I gave them to my mom when I upgraded to the Pro DJ 100. I probably used them for a couple weeks straight and loved them.
BTW that muffled sound right out of the box went away for me within the first two days. Just after burning them in overnight. Luckily I never had that issue with my Pro DJ 100s.