Building a custom bike from the frame up is a different experience than buying a pre-made bike from a manufacturer. It's like going to a high-end clothing store and having a tailor take your measurements and create an article of clothing made specifically for your body dimensions and personal style. As you can imagine, the results would be more comfort, better performance, and a higher sense of satisfaction. The same idea applies to a custom-made bicycle. You get to make the final decision on every aspect of your bike. What color you want your frame to be, the exact components you want to install, etc. You get to optimize each part to get the results you desire.