Thinking about saddles and was wondering other than the carbon rails on the Arione are there any differences between the standard T2 or the twice as expensive carbon counterpart? Is it comfort or is it all in the rails, I currently run the standard Tri2 with the chromoly rails. I notice that the standard tri2 is not vented however the carbon railed version is and has different material on the wing flex. Anybody tried both and felt any noticeable differences while riding ? 