SpeedoTT I’ve only tried a handful after doing exhaustive research on this site as well as others, and have been happy with CQUK as well as some other more “boutique” offerings that I don’t think are sold on this site.
I don’t know if my success is due to the time spent on the forums or just luck but I’ve been happy and the people I’ve done vehicles for have all been extremely happy(even after weeks of living with the coating as I like to follow up with people on the more intensive jobs). As with most things the preparation is where you spend the most time, and is often under appreciated.