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Looking at it, it seems complex, but plot out the movement and it's pretty elegant.
First off, the power stroke is offset way to the side, and the conecting rod moves almost completely vertically, limiting side load and minimizing friction. Also, you have less horizontal movement at the bottom of the con rod than in a regular piston with the same stroke, and the counterbalance on the other side of the crank moves even less...
This all means less counterbalancing, less weight, smoother operation and... supposedly... the elimination of balancer shafts.
Sure, it's a little more complex... but with more parts under... presumably... less stress... it should all balance out.
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