I have not tried Fizik saddles yet, the Romin has been so far the most tolerable saddle I've ever ridden. I'll be able to swap back if I want, but it's a big leap since Fizik saddles seem pretty expensive.

I only want to try because I feel that the flat Arione or Antares might be more comfortable.

Concerning 3T vs Thomson, I remember Scrod listing the weight of 3T as more than twice the weight of Thomson parts. Is there an explanation for that if my memory serves correct? (Usually doesn't)