Ken,
Welcome to the site! Like quite a few others here, I bought the concourse kit on the recommendation of the people on this site. I've used the Groitt's stuff and McGuiers previously. I decided to try it on one of my saddlebag lids that had quite a few surface scratches from passengers getting on and off. These scratches didn't come out with the 2 products mentioned in this thread. All I can say is that I followed the directions for the 3 products in the kit, and while it's a bit time consuming, I have a very shiny, scratch-free lid again! Now all I have to do is get the ambition to do the rest of the bike...