I picked up the Firefly recently and ran some tests against my GoPro 7. It's not as good but it's got a lot of redeemable features for the price. In low light it really struggles. I shoot a lot into shady areas around dawn and dusk and frankly even the GoPro doesn't do well. But the Firefly struggles more than the GoPro and provides a significantly noisier image and additionally does not provide 240 frames per second @ 1080 like the GoPro. For those dawn and dusk situations I will still be using the day/night sight setup instead. When compared to the GoPro you are taking a step or 2 down in durability and the battery life isn't nearly as good. The frame of the Firefly is definitely cheap and even the inner workings bend when placing or removing the SD card. I'll keep the Firefly around for a while. It is nice to have another camera with a 90 degree angle in the collection that isn't dedicated to scope work. By the way - the GoPro does have one touch recording as well. Just my 2 cents
The noise on the image is due the lack of light, you are right, and if you are using a sideshot you will get more noise compared if you are using another system, eagle vision for example... the reason is the glass inside the sideshot....
To me the real disadvantage of the Firefly vs GoPro is that I don't get 240fps, but image quality is not one of those concerns, at least to me.. I struggled for years with a Firefly to achieve a good image quality and I'll tell you one thing, the problems you are having is not the camera... Check this out:
https://youtu.be/IoFRVNlRdRQ
https://youtu.be/6xa9ainsy9k
I have always 2 Firefly cameras around, just in case one dies, and so far I haven't got one bad, but again, for the price of a GoPro plus the lens I can afford probably buying 4 of these cheap cameras, and that to me it's a huge win, because the money I save on this I put toward the scope and use my GoPro for filming, in the end what you are paying for the GoPro is the amazing image stabilization that you will be throwing away as soon as you dedicate this camera for scope cam.
With 120fps from the firefly I can get the pellets in flight no problem, so I really don't feel the need of the 240fps, will it be better? I bet, but after seeing the images I can get out of a Firefly... it's really hard to me to go to GoPro, also on a personal note, I tested the GoPro, old lens, I know there's a new lens around and I can't speak about that one, but the old 12mm lens was always giving a soft image, I can even say that the image was out of focus, while pixel picking, with the firefly I got a very sharp image.