Purchases you regret
I wish I studied up more before my build, I wasted time and money on things that either didn't work or didn't work well enough.
Sportourer elastomer seat - should have gotten a cloud 9 from the beginning, the elastomer seat sucked.
Spring tensioner - unless it's from TurboBuick, don't bother with anything else. I finally have one of his enroute, compliments of my girlfriend for valentine's day.
Origin 8 Batwing bars - they look awesome but they aren't very comfortable, I knew that, but I thought it could be manageable. It might have been, if my to tube wasn't so short.
19" frame instead of a 21", 23" frame. I wish I got the bigger frame, it sucks that I didn't, especially because the same bike comes in bigger sizes.
Quality kit - I ordered a kit from a vendor that came without a rear mount and didn't start. Took me weeks and weeks of headaches before I got a refund and got another motor. Now I've found vendors who are more trustworthy.