I've got a few more questions about the WS77 and 99:
How light are these? Are they comfortable to wear around your neck? Personally, I found the M50 to be a little heavy for my neck.
Current impressions on the build quality?
How comfortable are they with glasses?
Honestly, I want to like these headphones, but at these prices, I'm disappointed that the cable isn't at least detachable. If sound quality is only thing going for them over the WS55, then they better sound like they're worth the extra dollars they cost.
Hell, I don't even care much for fashion, and I like the way the red WS55 looks.