We had a ECU that was having a voltage output issue. We sent it in for testing and repair. The techs were quick with testing and great at keeping us notified of where they were at and the findings. Our unit was unfornantly not able to be repaired, but they applied what we had already paid for the testing and repair to the cost of a new unit. They transfered the needed information, tested the new product to make sure the problem was gone and quickly shipped it out to us. New unit was just plug and go and the ruff idle and votage issues that were there before were completely taken care of. We own an auto repair shop and won't hesitate to use ECU Pros again in the future.