I got to test the B17 Imperial when it was being re-released... that saddle has been perfect since the first ride and that was 6 - 7 years ago and it still looks new.

Most of my bicycles have leather saddles which include Brooks, Ideale, and Wright's (W35)... my Ideale 92D touring saddle might be the only one that can equal the B17.

I also have a number of Terry saddles (leather) which are also excellent and use one of these for touring.

After that there is nothing wrong with the right synthetic saddle... I race on a Turbo Matic which is also a great distance saddle and has an advantage in that it is very sticky.