I'm coming to the conclusion that when Geoge Daniels designed his Co-axial escapement to challenge the stability and accuracy of the quartz wristwatch, and sustain public affection for the mechanical wristwatch he certainly succeeded - in my case at least.
I've had my Aqua Terra for three months now, and at the end of February, as I unscrewed the crown to advance the date, I realised that this was the first time I'd had to unscrew the crown since owning the watch. The time was still pretty much spot-on. As I type today, the watch is just one second fast after having been running for over three months (and I've not had need to re-set it during that time). During this time, the watch has never been more than a few seconds adrift, and I've not done anything special with it - I've just put it on in the morning and taken it off at night (and not worn it when I've been servicing my motorcycle).
I've had a few (too many!) mechanical wristwatches over the years, and many of them have been good timekeepers, but this particular example of Omega's 2500C movement is just outstanding. None of the quartz wristwatches I own are as good timekeepers as this - a fact which I find quite astounding.
Regards,
Michael