I don't have a KC, but it seems most of the issues with the Virus synths involve the operating systems and not hardware problems. The Virus B and C models are more stable than the new TI models. That being said, there is always the potential for defects with instruments, especially used ones. That's why you need to clarify the return policy with your local GC regarding this instrument.
Most people seem to buy Viruses because they just gotta have the sounds. If you feel that way about the KC, then you'll likely be happy with it. I doubt that GC would knowingly sell an instrument that had problems. And my guess is that you wouldn't have to ship it back to Germany if it needed repairs.... there should be some authorized technicians here in the US.
If you want a "sure thing," then it's hard to go wrong with instruments made by the big Japanese guys - Yamaha, Roland, and Korg. They're Dependable with a capital D, like buying a Toyota or Honda. But depending upon the kind of music you're into, those synths may not suit you the way that the Virus does.
The Lexus may be a better engineered car, but I prefer the "soul" of my Jaguar in the same way I prefer my TI Polar over the Korg MS2000. The Jag may be in the shop now and then, but it's a small price to pay for a gorgeous automobile that oozes character when compared to a dull, boring, feat of Japanese engineering.
