I had built a list of 4-5 slightly problematic items, including odd, herky-jerky acceleration, from low speed, and possibly a dying battery. In less than a full day, my 10 year old car was completely running like new, with all problems addressed and solved. The problems were clearly discussed, and were typical of my vehicle and it's mileage, and the 4-5 "fixes" ending up costing less than I expected.