Received my rear-only Gelaskin the other day, and very happy with it.
Knew what to expect as the gf has one on her Kindle. Very robust vinyl that will protect from scrapes and light scratches whilst adding virtually no additional thickness or bulk to the unit at all. I'm basically paranoid about putting it down on any surface in case I get some dirt or grit trapped under it and scratch it so this means I can stop worrying.
It was relatively easy to apply although lining it up perfectly took a couple of attempts. Luckily it's easy to peel off and re-apply.
Had a couple of minor issues though. Firstly the cutout for the headphone socket was slightly off so I had to trim about a millimetre from it to make it fit properly. Secondly, there were very slight ripples or bubbles in each of the four corners, where the case starts to taper, but with a bit of perseverance and re-application with a touch of pulling/stretching, I've managed to get rid of these.