I have a 520 and a Madone road bike. I really like the fast road bike but also wanted a tourer so I can do a little touring. I actually like riding the heavier and slightly slower touring bike better. It is smoother on the roads, has lower hearing for climbing big hills. When I won't to just get on a bike and go as fast as I can, I get on the Madone. But most days I just want to ride and I find myself taking the 520.