The IDS and IPS features are valuable. From the usability perspective, there is a lot of good documentation. As IT professionals, we found it very easy to configure the firewall. It was easy to configure and use. 

The most valuable features are reporting, the Sensei plugin, and firewall capabilities.

The VPN server feature is the most valuable. It is integrated with Radius and AAA for doing accounting and authentication.

Insight view is also an important feature for me at this time. It allows me to assess our network traffic. I also like the firewall feature. The BSD kernel has a packet filter. It is one of the most solid frameworks for firewalls.

Its user interface is one of the best interfaces I have used. 

OPNsense is easy to scale when running on the hardware.

The normal security options are great. 

It's light and easy to manage.

The solution is very stable.

The initial implementation process is simple. 

The solution offers a free version.

We have found pretty much all the features of the solution to be valuable.

I have found the solution has some great features overall, such as guest access capabilities, dashboards, and ease of use. There is plenty of documentation and support and it has the plugins that I needed.

The system in general is quite flexible.