This is the first time ever used this and they are great and handy. The anit-scratch machanism designed (to the top of ring) by the company is user friendly. Little tiny rubber on the top can prevent from encounter any unecessary accdients. And the 3 M sticker on the back works well and is gentile to my smasung 7s Edge. None like other brand, the ring is not too hard to pull and the samll rubber cirlced within the metal one creates a great touch. Over all, this is my first time use this product and I am very glad and fortunate to have it on my device.