I've been using the x-grip for a couple thousand miles now, both on and off road and my phone has never even slipped. I am quite happy with it.
But I ain't Travis Pastrana, either! :)
Sent from my Samsung Note 2
I bought it to ride it, not wax it.
Soak it all in, It's a game you can't win, Enjoy the ride
"There's a very fine line dividing bravery from stupidity..."