I currently have the specialized Tellluride saddle which has Ti rails. I want to reduce weight. I checked out the selle Italia SLR carbon and SLR XP, SLR 64. I would like to reduce the weight of my stumpjumper 2003.

Has anyone used the SLR saddle I mentioned above. Does it flex when rider sits on it? Are the rails strong enough to hold the rider? Is it durable in long term ?