I’ve dealt with ECU Pro twice within a year on two different cars. I can honestly say both experience was excellent. They are extremely professional and keep you in the loop. First experience they helped me narrow down an issue I was unable to figure out. The last one they fixed my no-start issue. In my opinion, the only thing I do like is the cost of 2day shipping. I feel it’s a bit costly. I used their standard shipping and received my items in 3days. I do live on the east coast so that’s probably why I received it faster. Other than that they are my go-to company for my needs.