This works very well for one of my customers. I loaded pfSense onto it. The manufacturer has a very well documented install guide on their Web site that walks through step-by-step how to load pfSense on it. The one thing I worry about is how warm it gets without a fan. The server room I put it in doesn't have a lot of air flow, so it is about 85 degrees Fahrenheit, and without something moving the air past the fins, I worry that the CPU will get too hot and die. I got a small clamp-on fan that I put onto the rack rails and have it pointed directly at the top of the unit, and it cooled everything down very quickly to a nice room temperature. The whole idea for going without the fan is to reduce Watts used, but now that I have a fan running all the time, that defeats the power savings idea. I would say that if you have a low ambient temperature (less than 75F), you will probably not need the external fan.