Ever since adhesive companies like 3M came up with high-quality sticker materials, companies have slowly but surely been licensing brands, logos and artwork to help us personalize our laptops, car windows and personal electronics. The first generation were a pain to work with because the stickers were often too sticky: put them on slightly wrong and you were quite literally "stuck" and lifting corners to erase stray bubbles or seams could end up ruining the skin and leave it unstuck on one side.

The latest generation are a huge improvement with their increased thickness and extraordinary vivid color retention. They can be cut into extremely accurate forms and custom fit whatever device you have. With iPhones, they wrap around the back of the phone and include cut-outs for the camera lens and an irregular edge that neatly extends the sticker without covering up any of the controls.

But are they worth it? Should you rush out and drop $15-20 to emblazon your favorite band, artist or comic book hero on the back of your iPhone?

To find out, I was given sample skins from the two main players in this market: GelaSkins and MusicSkins. Both use the exact same 3M film, and both seem to use the same die to cut their stickers to fit the iPhone, so the difference is primarily in the graphic itself. But there's more to it than that, as you'll see...