This story in PC Magazine tells it all: http://www.pcmag.com/article2/0,2817,2471158,00.asp
From the article:
PC Magazine wrote:The bottom line is that Internet access in Puerto Rico is available, but it will break your heart. There will be times when you are left waiting for your beloved Internet to return. Or you are anxiously checking your cell phone for a callback that never comes. You can expect service, but it won't be consistent or great.
Posting after posting by people who say they are customers complain that their service is non-existent, and that the company's customer support is just as disconnected.