I have been using the solution for a year.

I have been using the product for four years. 

It has been almost one year.

We have been using Rapid7 InsightAppSec for seven months.

I have been working with Rapid7 InsightAppSec for five years.

I've been using the solution for three years. I've used it for a while now. 

I've been using it for almost a year.

I have been working with Rapid7 InsightAppSec for two years.

In total, I've used the solution for about one year.

I have been using this solution for about four to six months.