Hey....
I thought that S100 is the same thing as P21S. It cost a lot cheaper though.

It's all in the marketing....many manufacturers do this.....

Brand Marketing Niche
P21S automotive $31.95 up from $24.95 a year ago
S100 motorcycle $14.95
Recently some have stated the formula has changed etc.....S100 has some flex agents for the bike....Check out the packaging still states great for the car....They are starting to realize they are losing money due to the Harley Dealerships which sell it reporting that they can't keep enough in stock. It is the same stuff for 1/2 price. I use it all the time.

It gives a deep wet look as your LSP.

Pinnacle
Souveran automotive $59.95
Signature (souvergn jr) automotive $29.95
Cycle Paste motorcycle $29.95 WOW this went
From $14.95 just a year ago

Souveran has a legend re: dark colored cars (Black, Red, Blue). Deep rich 3D effect, not really reflective Very Very deep.

Signature, Cycle Paste are both Souveran Jr......they are not quite the same as Big Daddy, close enough for a daily driver ...real close!

These are all geared to the car Enthusiasts.....

Truth of the matter is, after experimenting with a dozen waxes and sealants over a two year period my conclusions are if you use professional detailers waxes in bulk from Top of the Line or Meguiars as examples, they will all produce excellent results because the wax will only bring out what you have done underneath....Polish, Remove defects, etc......Cleaning the paint is so much more important than which wax you use!

In real estate and Pitching in the Major Leagues you are concerned with Location, Location, Location.
In detailing concern yourself with Cleaning and Polishing your paint, removing defects.

The Zymol that was mentioned is really for Concourse Vintage car collectors.... actually there is very little durability in those products.... they are not designed for daily drives at all...If you are fortunate enough to have a car collection like Reggie Jackson (or you did have one lost to fire), Jay Leno, Sammy Hagar, Eddie Van Halen - you may be using these thickly rich oiled waxes...purely for very pampered vehicles and those who have some $$$$$.

= my $.02