Summary: I spent quite a bit of extra time using the ROCCAT Kone[+] and Isku together in order to get the feel for the entire system for this review. With Isku I had come directly from a high end gaming mechamical keyboard featuring brown cherry switches. That's pretty tough competition but Isku fared better than you might expect. Keystrokes were confident and crisp with no discernable lag or false feedback.
Pros: Very Responsive for a Membrane Keyboard, Class Leading Customization, Attractive Design, Comfortable Shape and Finish, Amazing Customization, Can't Stop Looking at the Lighting, Class Leading Sensitivity and Control
Cons: No wireless variant, Can be a stretch to reach all buttons