I have been working with Steelhead for a year.

It was a few years ago that I was using it, but I was using it for about 5 years

I have been using Steelhead for the last ten years. 

I have been using this solution for 15 years.

We've been using it for approximately nine years.

I've been using this solution for 13 years. 

I've been using the solution for more than ten years at this point. It's been about a decade or more. I've used it for a long time. 

3+ years

I have been using Steelhead for five years. 

We've used it for approximately five years.

I have been working with Riverbed SteelHead for more than 15 years. I have a lot of experience with it. I have implemented it many times, both on-prem and in the cloud, around the world.

I've been using it for three years.

I've been supporting it for seven years.