I have no experience with the Selle An-Atomica...but I seriously considered it and after reading your post, now wish I had given it a try. I too, have been dealing with some difficult saddle issues. I came very close to ordering a Titanico LD, a few weeks back. I love that it comes in various colors (I wanted the white w/black rivets). I viewed the demo video on their site that has a camera angle just below the saddle...where you can actually observe the saddle conforming to the rider's butt with each pedal stroke...very interesting! I hemmed and hawed over it, and ultimately ended up trying a different saddle (a Specialized Toupe 155) which seems to be working fairly well for me. But I still wonder how much better that SA-A Titanico LD would feel. Given their 30-day return policy, I suppose it couldn't hurt me to order one and try it out.
So...it honestly felt THAT GOOD, huh? You didn't get any pinching from the cut-out? I ask only because I keep hearing some folks say that the cut-out on that saddle looks like it would be a "pincher", yet I've never actually heard anyone voice that complaint. As far as the saddle "holding up" for you...I think that is what the tensioning bolt is for. When it starts to get too soft, a few turns on the bolt is supposed to tighten things up again. Now how long exactly, before you run out of tightening room on that tensioning bolt...is the $64k question.
Linda