I was surprised and intrigued when I saw this and had to buy it to see if it works. Lucky for me, it does! This makes me think of the KISS acronym ( keep it simple stupid) because it's such a simple and small idea but very effective.
The package just contains the flip grip which has a small tag and link to their site. There are a few pictures showing how the flipgrip works which only took me a minute to figure out. I was mostly concerned about positioning because the adhesive is actually quite strong so I knew that it would be difficult to readjust later. I just held my phone like I normally would and put the flipgrip on my middle finger
I can still put my phone in my pocket and don't even notice it. So its not instrusive. All in all this is a great idea come to life.