For what it does, merely changing a theme, Shapeshifter is at $20 too expensive. In order to fully utilize it, you will also need to register Unsanity’s Mighty Mouse, which comes at an additional price tag of $10. So, we’re dealing with $30 in the end, and most often you will find yourself return to Apple’s preinstalled theme anyway. Actually, you will come to value how well done Apple’s theme is indeed. There’s few Shapeshifter themes out there that warrant a constant use... as mentioned elsewhere, too much sci-fi and for those who really need to work on their Mac most themes are, after a while, not easy on the eyes. Wait for the next release of MacOS X and you will find the new Apple Mail theme introduced under Tiger (and very similar to the Iridium theme on Shapeshifter) all over the system.