I have used this solution for eight months.

I have been using Dell PowerFlex for one and a half years.

I am currently using the solution and I was part of the engineering team that developed Dell PowerFlex.

I've been using this solution for one year. 

I have been using the solution for one and a half years.

I've used the solution for a little more than a year now. 

I have been using the solution for more than seven to eight years.

I've been using the solution for one year.

We've been using this solution for the past six years.

I have been using the solution for approximately two years.

We have been using VxFlex for about a year and a half.