Your shirt doesn't have to stop at the second button.
Note that this is mostly just a directory listing. There's a lot of guidance out there about how to pick a tailoring house. All I'll note is to try not to get lost in quality -- if you're going to splurge on a bespoke tailor, you have to appreciate the house style.
Excerpt? Dude, this article is over 9000 words long, and covers... all collared shirts. You ain't getting an excerpt.
TL;DR: buy the UnderTwills, particularly the boxers. The shirts are fine at bundle prices, but nothing to write home about.