YouTube "Landpet GoPro Hero 9" to see examples, unboxing, demos, etc.
I returned the Hero 8 after a few days of use. Even though it was good quality, it had app connectivity issues, overheating issues and battery wouldn't last.
Hero 9 has somewhat fixed issues:
Battery definitely lasts longer (still not amazing but better)
App connects just fine now (no more can't connect or can't find device)
Does get hot.
I also like some of the new features like hindsight which saves you from recording many retakes (granted it still drains the battery). The ability of timewarp to go back to normal recording instantly. The 20MP stills are much better as well.