The RS is more relaxed than the S3. I rented an RS while we were in HI. The RS is much more upright than the S3, not nearly as aerodynamic or as stiff. The S3 is a pure race bike. Check out what Thor Hushovd was riding when he won the World Championships.

I've done two HIM on it and I really like it and find it comfortable. But it is not relaxed.

Veronica