0 seconds is hard to believe and would be very rare in an automatic watch. You've synched it with atomic time? Please update us again in another week or 2 about how well accurate the time has been, I'm very curious! And I would consider going towards omega if they are really that accurate.
It is sitting at about +1 second at the moment for the last 26 days. It is because i have the COSC certificate and i am able to regulate it so that it keeps almost perfect time. It gains about a second during the day, and then at night i place it face down and it looses a second over the night, hence it keeps pretty much prefect time because i regulate it.
Most SMP keep between +1 to +3 seconds a day. I guess i just got a good one!