I want to have a go at bike touring this summer, so I thought I'd transform my old hybrid bike (Specialized Crossroads) into a touring bike. Looking for saddles at the Brooks website, I wondered if I should choose the B17 S or rather the Flyer S. I have never had a saddle with springs. Are they really useful on rough roads? The Flyer is heavier than the B17. Does the advantage of greater comfort outweigh the disadvantage of higher weight?