Edit: A Bug has appeared and does a surprise attack!

See the update log to read about it
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A simple implementation of a Piston based XOR gate.

The size (without levers) is 7X5X2 when built flat on the ground instead of on the wool blocks. If the alternate wiring (see last screenshot) is used, the 3rd level (directly on top of this gate) will not be powered by any torches. Inputs and outputs are all isolated.

I haven't tried to make it as space efficient as possible, but I do believe this is the most time efficient possible (as in the time it takes for input to be processed into output).

If you believe otherwise, or have tips to make it space/time efficient, leave a comment please =). Thank you