I would not recommend Imagepac Stampmaker Make Your Own Stamps Complete Kit
at all. The device itself works just fine, but the gel used to react to the UV rays is extremely sensitive to light. Unless you're in a room that has no windows at all, the ambient UV light will begin to harden the image as you try to scrub out the non-hardened gel.
I completely decimated the scrub brush that it came with trying to get the gel out of the cracks. These are two attempts at the stamps. They are certainly less intricate than the crown example they use in the YouTube videos. I'm not sure why it just turned out so bad outside of the very sensitive gel packs.