I've not run miners in one, but I have experience with the 1/2 cabinet floor standing model.  I've installed a few for customers in remote branch-office type setups where a dedicated MDF is unavailable.

While they are rated for 12kw of heat dissipation, the gear they are designed for does not move nearly the volume of air that these miners do.  Typical rackmount gear that is located in one of these enclosures is along the lines of a 5U UPS, a 4U SAN node, a couple of 1U switches, and 2-4 2U servers.  Even then, they aren't the most efficient thing out there.  Their focus is primarily on sound dampening, at the expense of cooling.