Ed, the Knee is painfully slow on mine, 30IPM. Considering what the mill is, it really isn't an issue except I'm impatient. As Hood said earlier, I'm planning on useing the quill on the hurco for the z and the knee for tool height compensation but I hopeing for 600 - 800 IPM rapids on all axis on it. The place a slow axis will kill you is doing 3d work. If all need to move equal amounts in the same amount of time, the slowest limits all. Actually that is true for any combo move.
By now, you should know about Britts knee. Its the first bit of her leg that you see after she breaks her foot off in your *&%&*^%. You know you can't denie that happens quite often.
Brett