When standing, I get 50/50.  I'm trying to figure out what the unbalance is coming from.  A friend says one of his legs is a little shorter than the other, so he is also unbalanced. Not as badly as me, but I always thought my legs were the same.  Next bike, I may have to get the favero assioma dual, which isn't cheap, but the cheapest around except for the magene and similar crank based powermeters.
Numbers wise, the magene is in the same ballpark as my stages single side, which shimano kept when they replaced my crankset under warranty.  My only complaint is with the magene chainrings.  I bent the inner ring when I tried to shift down going up a hill, fortunately, only 5 miles into the ride. 
Was able to ride back to the car in the big ring.
I've been charging once a month, not that I've had them die on me.  I'm heading to 3500 miles for the year.