Random update for anyone interested: I got my Selle Anatomica X2 last week and used it on a 50 mile gravel ride and 30 mile road ride.
-like OP says, comfy out of the box. (I ride without a chamois fwiw)
-no issues with the rails so far
-looks good, quality construction
However, the sides flare out unlike a Brooks. This has caused some chafing and sore inner-thighs. I’m going to give a few more rides to see if I build a tolerance, but it’s a really strange design choice. I guess it allows for the give/flexibility, but I have pretty thin legs and never have had chasing issues before.