GoPro has been performing relative miracles for years. Their products are well worth the money for the benefits they provide -- if you have a reason to use them.

I've watched a lot of youtube videos, some of which were shot with quite expensive gear. And honestly, the ones shot with a gopro set on wide (not ultra-wide) provide reliably great video in so many conditions, and very importantly without tearing or other weird artefacts which a lot of phones introduce.

Honestly, I'd like a 4th camera in the iPhone which is a GoPro...