I'd been eyeing the Mr. Colin's in cognac for well over a year and was over the moon once they went on sale. I was a bit disappointed to find they had sent the wrong color (walnut) but customer service was really fantastic and sent a replacement in cognac. I am normally a true size 6 in all shoes, and despite the recommendation to size up a half-size, I would actually size a bit down if you have a skinny heel or petite foot like me. While my foot width runs true to average and not narrow, the rest of my foot is slender and a bit bony, and the 36s were much too large. If you have that composition, or your heels tend to slip out of things, I would recommend ordering your true size or a half size down. While the toe box was snug in the 35.5, it loosened up after a few wears and now the whole shoe fits perfectly.
Also, just a couple of notes about the shoe, the construction is unparalleled and the finish divine. I SO appreciated the gentlemen's notch on the inside corners of the heels to ensure they don't catch on your pants. I really felt like this company took all the wonderful things about men's dress shoes and finally gave us the quality we deserve in a female-formed monkstrap.