The only "sticker" on the back of my screen (the one that I removed) was not glued. There was absolutely NO residue (sticky or otherwise) left after removing the protective plastic. R1Lover may have a different "sticker" that is held on with glue, but I'm not sure how he would know unless he removed it. I'll admit, until I removed mine, I though it was stuck on with an adhesive...but it was not.
But to each his own...that's the great thing about owning something...you can do with it whatever the heck you want!