OK, I'm extremely biased - I haven't bought a ready to roll bike since 1971. And I love rolling my own. I find the building is as enjoyable as the riding.
I will toss off a quick caveat to the above: Make sure you either know what you're doing, or, have a fallback person for some assistance when you suddenly realize you're up to your proverbial ass in alligators. And plan on putting down a good 300-500 miles on the newly built bike for debugging and modifying before you head out on any planned trip. Include at least 10% of that time fully loaded.
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Syke
“No one in this world, so far as I know — and I have searched the records for years, and employed agents to help me — has ever lost money by underestimating the intelligence of the great masses of the plain people. Nor has anyone ever lost public office thereby.”
H.L. Mencken, (1926)