KAK is the most consistently delightful thing about Union at the Biltmore. For $1.50, you get an adorable macaron, served with charm and humor.
Depending on the time of day, your macaron may be nearer to (or further from) its peak of frothy freshness... which I think is an argument for buying at least two, one in the flavor you originally intended and one in a "wild" flavor where the sheer novelty is part of the payoff.
The gift boxes are a reasonably priced way to impress the hard-to-shop-for, and even after three days in Priority Mail, I've gotten raves.