Sinful Colors excels at good cremes for astounding prices. At $2 a pop, I can afford to pick at run of the mill colors just because I fancy them. Whereas with a brand like OPI or even Butter London I have to be sure I pick a bold and gotta-have-it color, with SC, I have no problem just grabbing at random. This is not a slight, but a compliment; especially since I love how non-problematic most of their polishes are, especially the performance of their cremes.
Case in point Amethyst. It's a standard purple creme but application was excellent and it looked great even before topcoat.