I had to order a half-size larger than my usual size. Also, I often have issues with heel slippage, and it is very difficult for me to get the heels to stop slipping. The construction is great, and I love the tread, which offers very sure footing on slippery, gravely, and muddy trails.
UPDATE 29-Apr-18: After about 80 miles, the heel-cup material has failed in both shoes. Due to this failure, somewhat non-standard sizing, and the impossible situation with heel slippage, I would advise against buying these shoes, the Wirecutter review notwithstanding.
Thankfully, my Amazon customer-service representative took care of my returning the shoes even though the return window had closed. Much appreciated!