Another fan of the Selle An-Atomica here.
I've tried various Brooks including the Imperial which never felt
right to me.
I have tried the SM Rolls and Regals and though I thought they looked
great they
were typical of most plastic shelled saddles, uncomfortable over any
distance.
Though my longest riding experience is just one 200k to date, the
saddle area was not an issue.
I had an early version of the Selle AA which was not the Watershed
model and it wasn't as
comfortable as the LD Watershed I have now. In fact, the LD Watershed
version seems like
a different saddle altogether in a good way. Recently rode 75 miles
in the rain and the saddle
held up and recovered nicely. No misshaping and, yes, it's a much
faster break in than a Brooks plus
it has the longer rail for easier adjustment.
It's expensive, but I'm glad to have it on the bike. Also, I ride the
Clydesdale version since I'm
200 pounds. The clyde version uses more leather which is a good thing
in this application.
Hope this helps.
Rod