The Arione allows me to move around in different positions more easily than other saddles I've used. The shape felt a little awkward at first, but I grew accustomed to it after a couple weeks and don't notice the difference anymore. I've done many rides in the 50-100 mile range on this saddle and have no complaints. I was also pleasantly surprised that the Arione's actual weight on my scale-200g-was exactly as advertised.
My 3 stars is only because it didn't fit me. The Arione R3 is a quality saddle, and very light for one with-out using carbon rails.
I don't think Fizik's fitting guide is worth following though.
I am going to try the Antares from BTD,(good prices and quality bike stuff).