I've decided that I haven't spent much money on my Madison so I'm going to buy a Brooks B-17. I checked around and see that there is a classic that everyone raves about but also see a B-17 with a cut out that I haven't heard much about. I have a Terry Fly (with the cut out) on my Felt and find it comfortable. In deciding between the classic three hole and the cut out B-17, have any of you felt an appreciable difference?