Media keybord 600=sucks. Media Keyboard Elite=good.

I tried the 600 in a shop, most sloppy space ever and i bet it has keylock. Media Keyboard Elite has no keylock at all concerning playing worms, you can press all 4 cursor directions + space at the same time. Also no keylock on the F keys when pressing cursors i think. And the space is pretty good for a year or so, then gets pretty sloppy, i use the right shift to tap now...