By the time Brian and the rest do the add-ons, I think they're only making $30 or so... They're adding chain guard, clutch, etc. etc. and it's worth it to me to have it all as one bundled package. You could easily pay more in shipping from multiple sources than they're making... Plus they see so many they're likely to notice something that looks unusual. But I'm also a fan of DIY, so nothing preventing you from assembling yourself. I'd check valve clearances, check pop-up, break-in, re-check clearances, re-do valves after 3 race bed-in, then race the heck out of it.