The team has been working with us since 2008 and is highly professional as well as very knowledgeable about security systems including network firewalls and VPNs. They are always willing to work through any issues that arise during an engagement or after it's complete. I have no complaints at this time! But if you do contact them for help they will be able to answer all questions relating to their products - which include both physical hardware devices such as routers/firewall equipment AND software tools like anti-virus programs. We needed some assistance from NIS when setting up new firewall rules related to mobile application usage within specific corporate networks. I've worked with this team for more than 5 years now at different companies. The level of expertise is always very high and they are able to adapt their work quickly to new technologies. They have been working mainly on web applications but also some mobile apps. Their knowledge of tools like Metasploit or Burp Suite is really impressive. It's not easy finding someone who knows all these things as well as they do! We used them for pentesting projects (web application security).