Go pro photo quality?

I currently shoot with a Nikon d40 and a Sony a330. I've been wanting to do some more underwater photography looked into getting a housing for either of them but it's pretty price so recently I've been looking at the option of getting a go pro. But I'm unsure of the print quality and the ability to blow up the images. I'd probably use the video but not as often as the stills. I've also read that you can pull stills from videos and they are relatively good quality. I've been looking at reviews of the go pro hero 4 silver over the black mainly because of the lcd display and I don't think I need to take 4k videos. I'm looking for honest opinions and or other people's experiences with printing or using go pro stills. :)

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On my Nikon D5300, i saw a dust spot I clean the sensor and mirror. It did not go away?

On my Nikon D5300, i saw a dust spot I clean the sensor and mirror. It did not go away?
Added (1). I had a better look. I found that dust speck is inside of camera. Inside side of the focus screen. How do I get this clean? I watched you tube videos of Nikon and canon cameras focus screen been replaced and clean. It looks simple enough. Should I do it or better to take it to a camera shop and let them do it. I KNOW this does not affect the image but its right in the middle of screen so huge distraction.
I am an electronic engineer so i do work with very fragile circuits and steady hands

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People with nikon cameras?!

hey so i was wondering if some nikon owners could give me a review of their camera(s)… I am looking for a nikon i'm just trying to find the right one. :D thank you awesome nikon owners!

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Are those point and shoot cameras that look like DSLR any good? From nikon?

Are those point and shoot cameras that look like DSLR any good? From nikon? - 1

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