I stopped into Cozumel Coffee several times when I was there Dec/Jan. Nice clean operation, friendly people, seemed to know their coffee well.
However... I wasn't fond of their roast. I've been roasting my own coffee for about 8 years (lots of different origin coffees, mainly Mexican or Central American & Ethopian), and I drink striaght espresso almost exclusively. The coffee at Cozumel Coffee is not roasted with espresso as the goal. It seemed to make a good French press or drip preparation, but for several reasons Cozumel Coffee wasn't serving great espresso*. I had a nice chat with them about it, and they acknowledged & completely understood my observations about the roast, bean age, and shot preparation. At that time, they said they were planning to change the roast frequency (and possibly profiles) to be able to serve better espressos.
* This isn't necessarily a problem, and may just be a case of a business accurately assessing and meeting their market. I don't recall seeing anyone else ordering straight espresso whenever I was in CC, and the espresso-based drinks that people were ordering had so much other 'stuff' (lots of milk, flavoring, ice, etc) that the finer distinctions in roast levels, age of the beans, etc, would probably have been lost anyway.