I think the shape and cut out of this seat are a perfect design for riding in the aero position. I am training for my next Ironman. My only problem is that the seat was a little too hard for me. I would say this seat is somewhere between medium and hard as far as the cushioning goes. if you are a triathlete and you like that level of cushioning, then this seat will be perfect for you.
Upgrading a TT bike and have gone through three different saddles trying to find one comfortable while on the skis and more upright. The Mistica saddle you end up perching on it. The ISM saddle is too wide. The Delta P saddle is a great width. You don't end up sitting on pressure points. I do have the nose pointed slightly down.
I am a tall rider and thus a bit bigger than most riders and Delta P seems to be aimed at riders like me.