The only thing i'd wonder about is loss of control. having that pointy nose part between your legs gives you something to grip.
The standard saddles leave so much to be desired, i am just not sure it
is worth it or wise to punish yourself long enough to get used to one.

i look at the seats on some road bikes and I am amazed that someone considers that something they'd like to sit on even for a little while.
I mean the inside of your buttocks which is where that thing goes is so delicate. there are tiny nerves and blood vessels, skin and bone. and it's not THICK skin either. if your seat is not supporting your sitting bones (and how could it if it is 4" across?!) it's digging into areas that were never meant to bear weight in the first place!