I’ve got a Fly 12 camera/light. It’s a big lump. The light is very good, the camera provides excellent footage, but to be honest I’ve been less than impressed with the overall experience. The operating system is complex, it relies on linkage with an IOS device, overlaying Strava/Garmin metrics is a chore that I can’t be bothered with, and it is a pain to remove from the Go Pro mount just to charge (I now use an exposure adaptor). If I were to do it again, I’d buy the small Go Pro session to sit under the Garmin on my K Edge mounts, and rely on a decent Exposure light, as and when required. By contrast, the Fly 6 is less feature rich and all the better for it.
That said, I used them both for a 3 1/2 hr evening/night ride last night and it performed flawlessly, but a Session and Joystick would be about the same money# and more flexible.
#(I bought mine for £200 before they launched, they are £300 now)