I think you've made up your mind that you want a fat bike and no matter what anyone says its not going to change your mind? If that's the case, the one you're looking at has a big discount and looks like a great deal. Go for the full suss its much easier on the mature back. Just buy a shock pump and dial it in for your riding style. A shame you haven't been able to try various bikes in the conditions they were made for. To try a fat bike on a typical UK mtb trail then have a go on a standard width tyred emtb might have changed your mind?
Good luck with your purchase Graham.
Good luck with your purchase Graham.