I have the Rearth Ringke Slim and I am not all that happy with it. the edges are sharp, it is not snug on the sides and it is almost as slick as the phone itself. I have never dropped a phone before and I have had the Note 2 slip out of my hands twice with this case on (and of course, it landed both times on the top section that offers zero protection.) I am also not thrilled that they could not make a separate case for the US market for the phones that do not use the retractable antenna.
I wanted a nice thin case...and well, I got it. If I was going to go this route again, I would go with the Quicksand ROCK case for less chance that it would slip out of my hand.
I have gone the other direction, I just ordered the Otterbox commuter case for when I am out in the field on assignment or out and about. I will leave the thin snap on case on while at work or piddling around the house.