I have a used 56cm conquest sitting in my closet waiting to be built for a commuter. I got a really good deal on this frame, but after more reading, I'm worried it will be too big. The top tube and down tube are the same as my road bike,but numerous opinions say "size down." In you're'all experiences, is this true? Can you explain why? It must be geometry?

JUMPR - If you're worried about harshness, you might try running a steel fork. Not as light, but a little more compliant, and certainly less expensive and theft-prone than the high bling carbon fork.