John, thx.

Question: what is the value of components? For example Domane 5sl vs 4sl - only difference is the component set - $500. (Shimano 105 vs Tiagra - 10 vs 11 speed)

Are better components more about the aesthetic pleasure vs performance - eg, most of my riding will be pretty flat - some hills but not real killer ones. Will I notice a significant improvement with $500 better components?