My b67 is my most comfy saddle, but I still do love a b17, I'd like to try a flyer as that's basically a b17 with springs (i think?)I prefer the ones without springs as the rails on them have a greater distance to the leather so my butt doesn't touch the rails.
I do have the creaking that Rob mentions, it did drive me nuts at first but now I just imagine I'm on grandma's fold out spring bed. I don't have any issues with feeling the rails, but I'm also a cushioned fella.