I think the Omni C upgrade was in the neighborhood of $550. The folks (Stromer) that sent it to me made sure that it was all setup on their side, but I decided after having done an earlier one on the old Omni that I would have my son ( an engineer) put it in. He was very good at it, and it worked perfectly off of his work. I realized that, I could have repeated doing it once more. He taped some of the replugs, just to make sure that there would be no slippage once it was replaced and has worked perfectly since...