That's been my impression, to, Admin. You have to know basic bicycle assembly, to start, which means you also need to know how to fine-tune your shifting and braking. Not that it's hard, but people tend to think it's voo-doo science, or something. Only wheels and wheel-building involve Voo-Doo.
What I've read, though, is they are a tinkerer's delight. Lots of mods you can do.
Mark
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Bicycling is my drug of choice. Followed closely by beer.