Keith accused me of using his boards to diagnose a machine and was a real prick about it. I sent him a video of a board I just bought From him that had an issue along with a video of the same machine working with a board from one of my other machines just to show him the issue. That turned into a mess. I also bought a board complete with roms installed by him backwards that blew the chips. Plug and play boardset. He refused to believe he did that and did not offer replacements. There are better sellers and cheaper sellers. I bought a ton of boards from him over years. In the end he really did not care about losing a customer. He did refund the opto board, but never offered anything for the blown rom chips. He refused to believe he installed them backwards. I did not think to check them prior to installing it. I always double check ready to install boards because of that.