Picked up one of those in mainland china for cheap cheap cheap last year.

I am 70% sure it's fake.

In a steady rain breathability has no purpose even if it existed. The humidity is 100%, so there is no humidity gradient to move saturated air out of your jacket. If you open the zips, you are just exchanging the saturated air in the jacket with saturated air from outside the jacket.

I somehow find myself agreeing with both the proponents and naysayers of goretex on this thread. And I do have at least one other jacket that is real goretex.