Con Sizing flexibility is limited
This model here is for small phones, it can only accommodate phones between 2.3 and 2.8" (58-73mm). So depending on the size of your phones, if you wanted one mount for both small and large phones this probably won't do it. There is a larger version of this product, the MePhoto Sidekick 360+ that can accommodate 2.99 and 3.58" (76-91mm).
The silver lining of this con is that there is less screwing and this makes for a more secure and stable grip on the phone.