Pre-106 casuc breeders was something very few could do, but reward was great. Properly making casuc reactor, and even outside water cooling required skill, but reward was great.
i found the standard 1840EU/t waterbucket-CASUC to be very simple in design and setup compared to normal mark 3 reactors with way to many complex cooling components for such a small output, but i also think that the gap between CASUCs and normal reactors was just to big to not get nerfed.
while i could get in on the action to explore the new reactor system i just don't think i could do anything else beside that without RP2, so i have to wait until eloraam feels like updating it