Southlake13 is this your personal observation or is it what you read somewhere?
I have an HV since a month and the 8500 is just amazing, it advances 3 to 5 sec per week (depending on watch's night resting position) which is an accuracy of 99.9995 to 99.9992 % !!!!!! (or +0.43 and +0.71 sec per day). ]
Sharlo, you have a stunningly beautiful watch! Can tell you are enjoying it. The +6 seconds a day came from a Watch Time magazine article on the new Aqua Terra (April 2013 edition, page 68). They said they ran the tests on their machine, apparently in their test lab. Since everyone on this forum who have co-axials are having a different experience I checked two other Omega watch reviews with co-axials Watch Time has done recently and both had accuracy in the 2.5-3 seconds a day. Guess the AT just needed a bit of fine tuning by Omega.
By the way, don't want to overstate the importance of watch accuracy. It is but one of many factors in picking a watch. And like everyone else, it seems, on this forum my mechanical watches aren't museum pieces. They sit on my wrist, and as such are responsible for making sure I get to the train on time, make it to meetings on time, etc. If accuracy was the only parameter we would all have watches with radio receivers to the atomic clocks. I have one of those and never wear it. At the end of the day I am here on this forum because of the fantastic little marvels that sit inside a mechanical watch, fueled by our arm movements. The fact that your Omega is accurate to 3-5 seconds a week is one of life's little joys. I am starting to understand why there are so many Omega zealots on this forum!