I got a Logitech G15, and it kinda annoys me feature like volume control, play/stop etc doesnt work if I have KO as active process, so if I wanna use my keyboard to turn down the volume, I must do a Alt+Tab before I can do it.
Basically, none application based features works while KO is active. And no, the so called macro feature from G15 doesnt work either, but it does for WoW. However, if u program the G buttons as a normal keyboard buttons, it still works.
I must say Logitech G15 have a really hardcore look Blue backlights on the buttons, a display that can show all kind of informations (CPU/RAM usage, date, time, new mail etc), and 2 USB connections to plug a joystick/gamepad, last but not least, whole 3 x 18 programmable keys! Its a must-have keyboard for a gamer