Qtan is a reputable dealer and he has very competitive prices through his own store. In fact, I have a KC 84 with Cherry mx blues that I bought from Qtan.
After my purchase, I heard that KC might have engaged in some questionable business practices as a splinter group from Leopold. Nevertheless, KC have produced a niche product in the 75% (84-key) form factor that appears to be practically identical to the Choc Mini and similar to the Race but arguably better than either of these products.
IMO, the KC 84 looks and feels cheap, but it performs reasonably well and fills a need for those who want this particular form factor. At first, I rather liked it, but after getting my Leopold FC660C, I do not particularly like my KC 84. It has hardly been used at all, and I will probably put it up for sale when I can find the time to do so.