Hello,
It is surprisingly solid for the price (certainly compares well with GearVR) and has both the IPD and focus adjustment (which GearVR doesn't have). It lacks the magnetic button that the original Cardboard viewer has, unfortunately. There is no touchpad neither.
We have compared the image quality with the official GearVR and I actually prefer this gizmo - the lenses have slightly less magnification, so the image is smoother and you don't see the "screen door" effect at all, while still having sufficient FOV. And this was tested with the standard GearVR settings, without any recalibration for the different lenses.
Pretty decent toy for 16 EUR delivered.
Regards,
Jan