I received the product a few days ago and have to say I'm very impressed.
I will use this on motorbike and cycle, but its basically here to replace the Tiagra version of the same sort of iPhone waterproof product.
I've got to say this thing is great. Compared to the Tiagra (and Biologoic as I've had both) its lots lots more robust.
The double clipping mechanism is a lot more secure than the clips of the other 2 products.
Even just one of these clips would be more secure (it actually hurts my nails a little to get it open but I'm fine with that) - but 2 clips makes me feel very happy that my phone won't fly out at the next bump.
With the Tiagra and Biologic I used to stick a red post office rubber band around the bottom as I didn't feel my £500 iPhone would be safe.
I was justified in doing this as the one time I lost my rubber band I hit a pothole and out flew my iPhone - Very luckily it landed on the grass.
I tested the waterproofness by dipping it in a sink of water - All good no water :)
This is a product is great and cheaper than the rivals, more secure (important for me as I don't want to break my iPhone.)
Fully recommended - also after viewing 2 of my friends have ordered to replace Tiagra product.