That mana fluxfield... it kinda obsoletes every other power source huh? A single mana tablet / half mana pool generates 5,000,000 RF in just a few minutes. I setup a combustion engine full of oil, let it run, and got a bit over 500,000 RF in the same amount of time (used up about half the oil). An industrial steam engine with a whole lotta steam, only a few hundred thousand... not to mention those require so much more infrastructure than a few endoflames and a coal dropper.
Is there any good reason to use any of the other engines once you can make a fluxfield (which is pretty darned cheap..)?