Here is a link to some of the photos I took with my recently purchased waterproof Lumix FT6 on my recent 10 day trip on the Franklin River. The only editing applied to some images has been minor level adjustment or cropping.https://goo.gl/photos/pyDqMjS7utMzEB5p6
All of these candid shots were taken in auto landscape mode, as I found it fairly impractical to use manual exposure when on the go (especially paddling in the raft). Overall the photo image quality is noticeably poorer than my Nikon D5500 DSLR, but I am very glad I took the Lumix with me as it allowed me to get so many shots that time and accessibility constraints would not have allowed me to get with my DSLR on a commercial trip such as this. The memories they bring back are much more important than the image quality.
In cloudy and overcast situations skies tend to overexpose, as did highlights in high contrast situations (as was to be expected). Compared to the photos I later edited from a companions Canon Powershot D20 waterproof camera, the Lumix FT6 had much more accurate colours, although the images from the Lumix seemed slightly less sharp than those from the Powershot.
Battery performance was pretty good. I was not used to the camera and a bit paranoid about battery life, so I took 5 batteries with me. I needn't have worried. Although I took 338 photos and over an hour of full HD video, I only had to use one spare battery. If I hadn't been also using my DSLR when at camp and some other stops, then I reckon 3 batteries would probably have been sufficient for the 9 days of use. Another companion used a borrowed Olympus TG4 waterproof camera and much to his regret he ran out of power from his single battery after only 3 days of use.
Where the Lumix FT6 really did shine was in full HD video mode. To my eyes the Lumix has very good full HD video quality and proved much easier to handhold steadily for video than my DSLR was. This allowed me to put together a video of the trip that captured the experience much better than photos alone could.
Overall I was satisfied with the performance of the camera for candid shots in situations involving the need to take a quick shot or the risk of water immersion/exposure. I will use it on my future rafting and kayaking trips and snorkeling. I expect the image quality results will improve a little with more familiarity with the camera and when in situations where I'm not under pressure to put the camera away and resume paddling!
The other group these waterproof/tough cameras would be useful to would be rockclimbers or mountainbikers, so they can take some impact punishment and still work.
However, I wouldn't use any of these waterproof cameras as my only camera on a bushwalk, due to the limitations that the lens arrangement and small sensor place on the photo quality. If only worried about drizzle, then it's probably better to use a normal camera and simply shield it from the rain with your hand or a hat.
Regardless, unless you are using the camera completely underwater, it is vital to keep condensation and droplets off of the lens of the camera, otherwise your shots will be ruined. So a dry cloth kept in a small waterproof container is a must have accessory.