Pretty happy with it overall, and still playing with the modes, settings, & features. Been experimenting with Dive mode vs. Standard mode video in ambient light, and leaning toward standard for general use at 40' and deeper. Dive mode seems better for shallow water with lots of natural light, but you'll get some very pink/red footage for a moment when transitioning from underwater to above water. Makes sense, since the onboard processor is reacting to a huge change in white balance, but I wasn't expecting so much red the first time I saw it.
Low light video is great, I've gotten ambient shots (my lights off, only light from the downline and other divers) on blackwater dives that my Sony a6600 rig has a hard time capturing well. With video lights, it's great, very true color render with no correction. I let it roll while shooting stills with a focus light if the situation permits, and have gotten some nice stuff that way.
Our cruise director on a Banda Sea liveaboard late last year had the latest DJI action cam and it did really well with stabilization and underwater color too. It was a tough call between the two. I'd say they're pretty equal overall with slight advantages for each. Neither is a bad choice.
Lance