Can anyone comment as to whether the combination of SkyDemon / PowerFlarm / Butterfly Connect works well?

Expect frequent drops in that configuration, but usually users don‘t give a damn. The only thing happening is - you see a warning when opening the track log that there are gaps in the log of x seconds. Some make a big fuzz of it, but realistic the crappy quality does not matter. Btw, Stratux would be the same and there are some big discussions, but see above - quality is dinosaur technology.