I have a KR-10. It's simple. That's all I can say. I haven't had many experiences with it. I have a Vivitar 28-105mm F/2.8-3.8 and an Auto Sears 50mm f1.7 MC. I have it laying around, so honestly, I'd sell the kit. I just feel like I don't stray from the Nikon F-Mount system enough to have another set. K-Mount lenses are fantastic, but I'd rather just have more F-Mount lenses to use with my Nikon bodies. If I had the same lenses I have for K-Mount in F-Mount, I'd be happy as can be.