itchyIt's stuck on with some sort of sticky adhesive. I'm thinking about removing mine too, but it seems like it will take some serious elbow grease and may damage the case depending on the chosen removal method.
itchyIt's a big sticker. It pulled off easily on mine leaving no residue. It is covering the ugly spot where the plastic is injected into the mold. Doesn't bother me, you may want to cover it with a different sticker.
itchyTo mirror A0.C's reply, it was indeed much easier than I thought. I removed mine and replaced it with some of my own preference. I also used a dremel to file down the bumpy flecks of plastic inside the center circle beforehand.