Went to the NY Motorcycle Show yesterday and picked up a bottle of Royal Blue. I got to work with it this afternoon, working on the bikes.
Here's my summary between S100 and Royal Blue:
1. Ease of use - winner: S100. They are both very easy, but S100 comes off with a bit less effort. Also, RB has a blue color that can get in crevices and stuff which you can see if you aren't careful. S100 is a clear wax that you can't see very much at all.
2.Shine - winner: Tie. They are both excellent. If you put a gun to my head I'd say slight edge to Royal Blue.
3. Cleaning ability - winner: Royal Blue. It's non-abrasive, but has a cleaning agent which can be helpful if you need that.
4. Paint correction - winner: Royal Blue. Royal Blue can take out minor swirls and does a great job of fixing stuff in the paint. Very effective.
5. Longevity - time will tell, but I may never know. The bikes always have wax on them.
Final Thoughts:
All things considered, I would give the edge to Royal Blue. It accomplishes more with the same level of effort. S100 is a pure wax. It's great if you have no other need than a quick coat of wax. If you need a cleaner that will correct stuff while you work and also provides a great shine, RB is the way to go.