I am 5'9'', 77 kg, I have both the Gilles Berthoud Soulor and the Aspin and I like the Aspin much more. The Soulor is giving me the feeling that I am almost sitting on the frame. I have only about 1800 km on it, but I don't notice any improvement. I am considering to sell it. The Aspin is great, though, comfortable from the beginning.