I have not used yet but I bought two, one for me for my HERO GOPRO 3 and one for my daughter for GOPRO HERO I just offer it. This idea of floating seems to me a very good idea. By cons I was disappointed not to be able to remove the item within a relay package. There in my building, but also in the entire city where I live packages of flight problems in mailboxes. So I was very worried about receiving the package. Fortunately I could open my box before thieves (those are operating regularly).