I got a similar kit to Kat's for Christmas, but I got the number 2 and number 3 polishes. I had some seriously heavy pin-stripes from treelimbs and brush dragging down the paint. A quick pass with the clay bar to remove grit and then a couple passes with the number 2 polish and buffer and they're almost completely gone. Once the weather clears and warms and I have some time I plan to do the entire VX again. It is easy to use and works great. They're pricey compared to products you get at Auto Zone etc, but that's because they're worth it...
As far as I know the products are only available online.