We have been using this solution for the past three years.

I have probably been using this solution for 10 years.

I've been working with Untangle NG Firewall for about three years.

I have been working with this solution for two years. 

We have been using Untangle NG Firewall for four to five years.

I have been using the solution for 15 years.

I have been using the product for five years. 

I have been using Untangle NG Firewall for two years.

We use the most up-to-date version. 

All of our firewalls are always up-to-date through the command center. We always update them as soon are they are released.

We have been using the solution for approximately four years.

I have been using the solution for about five years. I have used versions 150 and 500.

I have been working with Untangle NG Firewall for approximately seven years, since 2014.

I have been using this solution for more than two years.

I've been using this solution for about one year two months. 

I have been using this solution for 16 years.

I have been using Untangle for about one year.