As an it-enthusiast and founder/CEO of mxben GmbH in Frankfurt/M. I successfully rely on the combination of open source and commercial security & privacy solutions. We use a couple of IPFire appliances (bare metal/virtual) and I guess myself to be experienced in vpn technology and interoperation of IPFIRE with other devices (e.g. ZyXel, AVM).

As confessing fan of IPFIRE we monthly donate a small amount to the project and I highly encourage others to do so as well