I'm afraid to say that although the s2 is stiff as a stiff thing and very fast, it is one of the most uncomfortable bikes I have ever ridden. The cabling made me weep too.
R5 is a million miles away, absolutely beautiful. Smooth, light, handles well, descends by itself, and stiff too.
whisper
Specialized make fucking cracking bikes. My Allez Elite rides way better that my S2 did.