When you get into 15x binoculars, you have gotten yourself into the need for using them from a tripod. Almost nobody can handhold that much magnification steady enough to use the 15x to its capability (even those that think they can). You are going into another world going there from 8-10x. I have not used either one very much, but what I have says the Kiabab is worth the extra $$$. The extra glass really comes into play as distance increases or light gets dim.