There are two things that come to my mind when I read this thread:
Brook's saddles are not the only comfortable saddles, and they are not
the *most comfortable* saddles at all (I will address this in a
minute). I had couple of Brooke's saddles for over 10 years before I
switched to others, and I am glad I did.

Let me address the comfort issue first. In order for the saddle to be
comfortable it has to have two things: it should be able to absrob
shock and not transmit the shock waves to your butt, and it should provide
good perch for your sit bones. Leather saddles accomplish the first by
being flexible. Their suppleness gives suspension effect that damps
the road imperfections. In this respect any saddle that is flexible in
the middle will do the job. Check the saddle by pressing in the
middle. Ideally it should bend a few millimeters. If the mid section is rock
solid then avoid it (it may be good for racing folks with padded bottoms).
A supple mid
section is absolutely necessary for comfort. A solid surface is also
preferable (as opposed to gel and cushion) since the squishy stuff
just balls up and pokes under your ass. The second aspect of comfort
has to do with fit. Fit is function of your riding style (how much
bent over you are), and the distance between sit bones. It may be
surprising to note that a narrow saddle may not be the best thing for
narrow butts. You have to try out couple of different ones (atleast
try a saddle that is narrow where your sit bones are and try one that
is wider, just to get the idea). In this respect there is no one
saddle that is universally perfect, Brooke's or not. I personally use
a Titec Ithys Amore (I think it is a downhill saddle) for my commute
and it is more comfortable than Brooke's ever was (for me). I had
ridden for hours on smooth and rough terrain alike, and it has given
minimal (to none) saddle soreness. I am not sure if this is made of
leather though, it does not look like it. It is painted over, and I
cannot tell. There is lot of kevlar on top
(very abrasion resistant). The point is, you can choose your own
perfect saddle if you optimize on the factors that contribute to
comfort. There is nothing magical about leather or Brooke's saddles.

My gripes against Brooke's saddles are simple: they are not durable
especially if you park your bicycle outside (in rain etc.), and over
time they sag and the sides flare up like bird in flight. Carradice
sells some type of cover, but I had bad luck with this also. After you
put the cover on, the texture sucks and moisture still affects from
underneath. Brooke's use idiotic rivets that tear the leather when not
tightened right (happened to me once). If you are not hung up on
Brooke's old-world looks, or that it is British (ooo..!), then avoid
this junk. You will not miss anything. You may ask, why they hell did
I use this stuff for over 10 years. The reason was that (back in the
day) I used my dad's Raleigh and he only bought these saddles. I
generally did not care then, but now there are better alternatives.