I have sling-thing. I like it so far. It goes well on the back of my Seidio Active case, which then all goes into my Built Hoodie case. Now with all three of those (and insurance and a tempered glass screen protector) I feel fairly secure when I'm holding it one handed.
I've giving up trying to fight my tendencies to over protect. As the all too fabulous
ScandaLeX says I need a lunchbox when I take mine out.