i have had a few. I have traditionally been willing to pay for the best, like Vaja, but I think they add too much bulk. I saw the Griffin Wave on a friend's iPhone and knew that was it. I bought one and love it. Easy on, easy off, adds very little bulk, stay secure, stays clean, keeps the face open. It comes in multiple colors (you get 2) but I like the translucent back on my white iPhone.
This is definitely the keeper for me.
This is definitely the keeper for me.