I had a poor experience with White Performance & Machine Company, but in the end it turned out okay.

I had them work on an engine for me and there were a lot of problems. They would try and fix one problem, but that would lead to another problem. After the first job, I discovered that the water leaked into the oil and I had to get more parts replaced. The whole process was just a huge hassle. The technicians were pleasant and did try to address the problems, but it was just not a good experience. They did try to help me after the problem happened.

I can't say I wouldn't use them again; the motor runs fine now!