Got my Cougar QBX on Saturday.
My main complaint is that cable management is quite limited.
The space behind the motherboard is a bit too narrow for the ATX power cable, and as far as I can tell it's not possible to tie up cables so they stay in place and don't block the PSU grille.
There is a cable routing hole at the rear of the motherboard, but the PSU limits its usability unless you put uncomfortably tight bends in cables.
If you're a neat freak with your cable management, then look elsewhere - if you can take an out of sight, out of mind approach then it's a really good case for the money