Excellent Aero Position Seat
I use this seat for anything from Olympic distance triathlon to ironman bike distances. No numbness or loss of sensation at all while in aero position. It does not do so well when you sit upright. It does rub a bit inside the thighs but much better than most split nose or nose less saddles I've ridden.
Pros: aero position, no numbness, comfortable
Cons: not a good climbing seat, not a good upright position seat