Comments About pfSense
pfSense is a registered trademark of Electric Sheep Fencing LLC
pfSense is used as a short form for pfSense® software
pfSense is open source software that turns various small computing appliances and (even inexpensive, older) PCs into commercial-grade router/firewall/VPN/etc. appliances. The software project has a mature history, a serious full-time development team and a proven track record for delivering quality software. Commercial support is also available as well as pre-configured equipment.
Many years ago, after a multiple-week investigation of about a dozen options, we decided to use pfSense running on a relatively old/retired PC box over our initial choice of purchasing Cisco equipment (prompted by the difficulty of trying to become a Cisco customer) and have never regretted that choice. We have been very satisfied with the capabilities of pfSense as well as its stability, performance and evolution – and, even with donations to the project, I doubt we'd beat the "price to value" quotient, elsewhere.
If you're a business looking for a capable router/firewall/VPN/etc. appliance, I recommend that you thoroughly investigate pfSense.
If you're a home user looking for a capable router/firewall/VPN/etc. appliance and you either have significant computer knowledge or are willing to learn at least the basics about some of the (often complex) topics surrounding computer networks (or have a geek friend), then pfSense may be a good choice (and I'm so "geek" that I think the term "geek" is a compliment!).
While pfSense does have an excellent web-based interface, it's not an interface that's "dummied down" to target a novice user. Instead, pfSense provides a powerful interface that allows a myriad of capabilities but, in doing so, does expose lower-level abstractions so does require an understanding of networking concepts at a more detailed level than your typical home-networking appliance.
2014-Apr-08 : And now there's another reason to use pfSense, the Heartbleed and other security issues. Unfortunately, many home and small business networks will remain vulnerable because many of their WiFi/router/firewall appliances are vulnerable and are unlikely to ever be updated. A fixed version of pfSense was available within about a day.