I work for Zymol, so I'm excited to see people talking about our new music products and I'm glad you like the results so far.
One important thing to know is that you really only need very small amounts of the product to polish your guitar. We have heard similar comments from other customers about the small size of the product containers, so we just want to make sure that everyone understands that a bottle of say, GBC#, should last you for a decent amount of time if used properly. A little bit goes a long way. Of course, a lot of it does depend on how often you choose to treat your instrument.
What I personally love about the products is that they are great natural protective agents. They help the wood maintain its natural healthy moisture but create a barrier to keep outside moisture from entering in. Carnauba wax is hydroscopic, so any moisture that makes contact with the surface will be absorbed by the polish and not by the wood or paint itself.