if you're looking for alpine-style bindings with step-in, I'd take the diamir titanals or freerides over the silvretta 555. they are really nice. The reason I own silvrettas as well is for my mountaineering boots for approachs. sometimes I even just pack leather boots and take the freerides since it is so much more fun to ski in at boots than mountaineering boots, but I don't like climbing steep traverses with at boots...