Geez...someone sounds like an eVENT rep
A good way to check breathability of a fabric is to seal your lips around the fabric and try to suck air through. (insert crude joke here).
It's MUCH easier through Epic the eVENT or Dryloft.
Yes...it's less water-resistant than eVENT, but if it's been raining for 6 hours - why are you wearing a down jacket?