You stay comfortable, forever!
I now have about a month on the new foam saddle surface, with one on my mountain bike and one on my road bike. I would say that is an improvement on both bikes, initially subtle, but it grows on you.
In each case, the first thing that I noticed as I was dialing it in is that the biggest difference from the old surface is that precise individual fit is not as critical for optimal comfort. That is, it took many less iterations with the wrenches to get to what Jim calls the "cup your bones" fit.
The second thing that I noticed is that you stay comfortable forever. There is simply an extension from the old surface of the time that you can stay up there without squireming around to find a comfortable position. In summary, this saddle is a huge advance over anything that I have ever been on before.