I bought (among other things) the Wool & Prince merino button-down for a hand-luggage-only around-the-world trip last year. It is every bit as amazing as he suggests, and then some.
Same here (I spend roughly half of the year on the road). The shirt is not super durable (was too frayed to be presentable after maybe 250 wears), but amazing enough that I immediately got a new one.
