I used them when I bought my truck to get a baseline value for new oil and filters. Also had the oil analysis done, plan to keep doing this to monitor engine over time. The first one does not mean much since I have no idea on the miles and oil type, but it did give some data that is indicator of some engine condition. It was done in the Amarillo, TX location for me, right off I-40 easy access.
Overall I think Speedco did a good job, they had me witness torquing the plugs and showed me the trans and diff's fluid checks they did. After fuel filters they had me start it and then shut off to check leaks and final oil level check. Price was not that bad, considering if I bought all the filters and oil myself the savings was not that much. Of course they get filters and oil in bulk pricing.