I switched my saddle the other day in the never-ending quest to find a better fit. So I put on a no-name sprung saddle that's similar to the cheap vinyl Brooks saddles you sometimes find on old Raleighs. These are comfortable--but heavy--saddles and I rode at lease six miles on an untraveled rout of discovery. My bum has been unhappy with me and after the ride it was pretty happy, but the springs seemed too much for my back and sides. Often while pedaling id get this bouncing action going, a popping up and down in the seat that seemed to rob me of my power a little bit. I'd pedal along and the bouncing would grow according to my cadence. It was somewhat irritating, but man those springs did iron out the harsh bumps though. I'm still feeling it in my sides and back 3 days later. Well I guess the search continues. Soon a Brooks B-17... soon.