I love my B17s, we're trying the Team Pro for my wife's road bike, the B17 isn't working out on that one.
If you haven't seen it, check out this video on Brooks and how the saddles are made. Very cool and old school. (Video is 2 parts)
www.youtube.com/watch?v=z9w-y24Waz4
www.youtube.com/watch?v=aYirlnS19-s