Women: What's your favorite saddle?

Can I ask, how about these Brooks 'Imperial' saddles with that cutout in the middle?

Are they any good?

And something else: why are the ladies versions that are called 'S' and are shorter more suitable for 'ladies'? What is the advantage for women in a shorter saddle?
This cutout is something I can imagine that it makes a difference, but the length?

I have one of these... nearly killed me for the first couple of weeks! I persisted and now I love it. If you leave the 'corset laces' pretty loose the break in period is quite short.

Tried a San Marco Regal once and didn't manage 100 metres on it. I can only cope with saddles with the middle cut out.