I have been using it for the last twelve months.

I have been using SolarWinds Security Event Manager for two years.

I have used SolarWinds SEM for around six months. The project is still ongoing. 

I have been using this solution for a couple of years. When we first started, it was flash-based, and now, it is not flash-based.

We've been using the solution for about one year.

I've been using SolarWinds LEM since its inception, so that would be for close to 10 years.  

I have been using the product for ten years. 

I have been using SolarWinds SEM for about four years.

SolarWinds LEM is a product that I have been using for approximately a year and a half.

We've been using SolarWinds for three years.

For five months now.

We have been using SolarWinds LEM for three years.

I have been using SolarWinds Security Event Manager for approximately six years.

I've been using the solution for six years. 

I have been using SolarWinds Security Event Manager for a couple of months.

I have been using SolarWinds LEM for a year and a half.

I have been working with SolarWinds LEM for four years.