It fits my Iphone 8 plus with a thin case on, the mount has a rubber lining to reduce vibrations from my motorcycle and the fit seems secure. However, the build is plastic and I don't suspect it to last too long. However, for $13 the whole product is quite reasonable.
One complaint I have is that the release switch is in an awkward position.
I think this will be good if you dont have a heavy phone and dont mind needing to go through one maybe every year or so?