My main bike is scandium (Eddy Merckx Team SC). I love it. I have carbon bars, fork and seat post, but everything else is scandium (no carbon seat stays). I've done eight or nine double centuries on it, a 600k, 400k, etc. It's no more "harsh" a ride than my old bike, a titanium frame Colnago. I'm a fairly big power rider, so the stiffness that it has feels right to me.