High-performance open source VPN gateway as an alternative to a costly appliance

Hi /r/networking, for the last half of this year I have been hacking on libre VPN gateway software for commodity hardware (x86_64 servers): http://ift.tt/2mWbglT

Its intended niche is interconnecting outposts over untrusted lines at 10G, i.e. where network admins traditionally rely on big costly appliances, with the best hardware/energy/maintenance cost-efficiency possible.

Now that I have a working prototype, I am looking for more feedback from practitioners (that’s you! ;-)). Are you deploying some kind of VPN gateway? What do you like, dislike about the particular solutions you have deployed? What are must-have basic/extra/maintenance/monitoring features you seek in a VPN solution? SNMP? YANG? IPv6? How would you ideal deployment look like? Do you prefer to buy operation-ready boxes, or do you see benefit in choosing and assembling the hardware yourself? How much value do you see in being able to get the full source code?

Since I am basically asking for free market research here, I can offer to answer any questions you might have for a software engineer working on networking applications. Sorry in advance if this is not a suitable topic for this reddit.