COUGAR 600K Review @ Vortez
 

Holding the middle-ground within its product line-up the 600K comes equipped with Cherry MX switches, a detachable wrist rest, LED backlighting, and an aluminium strengthened backplate. Glancing upon the 600K at first sight, the similarities between the 700k are quite understandable, it's essentially a cut-down version in both size and features.

http://www.vortez.net/review.php?id=1025