For me I think I can tentatively say that wider saddles (even 155) tend to give me very crampy hamstrings. The wide saddle is also pretty soft, so the cramps could also be due to the softness factor. Terry Fly Gel is my favorite saddle so far, though I find it a bit firm. My search for saddle perfection continues: a B-17 is on order though I do worry about its width. Time will tell...