Just got it in today. Quick shipping by konova. Went out tuesday, and It got here today (thursday).
Honestly, I couldn't of expected anything better. Its fucking amazing. I dont think you are going to notice anything different when comparing the K2 to the K3. The only difference is 1 less bearing, and the wrench kit they include (just use your own). When there is no camera on the slider, it almost feels like a friction based slider, but once you put your camera on it, its smooth as butter.
I got the 80cm. I think thats the perfect length. Any shorter and then your compromising slide length, and any longer, I think it might be a little cumbersome. You could defiantly get away with 100mm, but I think the 80cm is plenty.
I
paid $229 shipped for it. Its a great deal if you ask me. Buy it before Konova jacks up the prices like they did for the K3.