Our unit was down and we needed the necessary boards in order to get it operational. With one phone call, not only did GTC confirm they had the correct boards we needed, but they also ensured me that they would have it to me next day. I had two representatives assisting and following up with me throughout the day to let me know the status of my order. I was impressed with the fast response and follow through. Even after our parts had arrived, the representatives contacted me to make sure we received them and if we needed anything else.