Taking your own saddle is actually not a bad idea. I nixed a gorgeous Trek 5200 WSD a few years back at least in part because after 5 minutes on the Bontrager saddle w/o cutout, my girly bits were very, very unhappy....and I'd been riding metrics and full centuries on my Terry Butterfly prior to that!

A bad saddle can completely ruin a ride, even a test ride!

Emily