Acceleration card = shorter work cycle in exchange for a higher power cost Capacity card = accepts larger stacks Redstone/Inverter card = Emits a redstone signal when work is done or when working (with the inverter)

I get the first one, I don't see a point to #2 or #3

#1 Is primarily what i'm after, 2 and 3 were ideas that came up when i was looking through the other cards in the list. #2 is a minor quality of life thing, mostly for before you get around to automating it. It remains useful after it's been automated, since it can remove the delay between operations where the inscriber is waiting to get items placed in it. #3 is useful if you want to signal to something else (buildcraft gate) that it's safe remove non-output items (like presses?)