I got my DecalGirl skin today and have it applied now. (My wife did it for me. She's all crafty and stuffs.) Somehow, in spite of the Kindle being clean, there are two dirt bumps on the back. Meh. Beyond that, the decal covers up the PagePress regions. (It doesn't stop you from being able to use them. It just obfuscates them, so you need to be aware by "feel" in order to use them properly. I've been using the Kindle for a few days and was easily able to make the transition to not being able to see the PagePress regions, so it's not hard.)
There's now zero issue with fingerprints on my Voyage though. I can rub on the decal and nothing happens. I'd imagine that even if I got something on it, it would probably wipe right off.
Fits in my case exactly the same as it did before I applied the decal...overall I am fairly happy with the results, so the $17 it cost seems a decent investment. (Particularly because I tend to pull it out of the cover a lot, and the decal provides some basic protection.)
This is the design I chose. The background is pretty subtle, but the crack in the planet is vivid and eye-catching. I like it.