Just unpacked my new Zowie (Cherry MX Brown - German Layout). This experience made me so mad, that I now have a geekhack account to rage about it... :-)
I'm a native Debian Linux user for more than 10 years. Never had trouble with a HID device in my whole life... After plugging in the Zowie via USB, a few keys (Strg/Ctrl, Win, Shift,...) simply don't work. Had a look at the keycodes this board sends. There is no (not even a minimal) delay between press and release of the key. Release even gets send while I still keep pressing down the key. This results in "press doesn't get recognized at all"!
On Linux everything works fine with PS2. But I bought this brown board for work and the stupid IBM box i'm working on don't have a ps2 port anymore...
Will try to find a workaround when getting home from work.... For now I guess I just have to let my anger out on my coworkers.... :-(