I purchased a bike that had one of these saddles mounted. It was comfortable but not useable for me.
I bought the bike fulling expecting to know in advance how it rode.
the seller was essentially a mirror image of my proportion. The bike felt Wrong.
the saddle rails had a very different placement of the clamp area, even all the way back the saddle perched me 15mm farther forward. This really effected the balance of the bike.
after transferring to a Cinelli Unicanitor, the world was once more in balance.