Here in the UK "they" are selling Asus windows 8 PC's. They are like any Win8 box have the ability to upgrade to 8.1, they announce this with a large sticker on the front of the PC. A very sticky sticker (I'd say harder that a Win 7 COA!)
I've tried to get the remainder of this sticker of for about an hour now, and it's not happening It now needs refinishing to look factory fresh.
I found the best thing to use to remove as much as possible is Citrus based TIM cleaner, but even this has left some marks.
So now I can't buy a computer with windows not because the lack of a sticker (COA) but because of a sticker!
On a plus side, if I ever need to fasten anything I can find the supplier of these stickers and buy them cheaper than a 40" head bolt.