I cannot detect it losing a second so far. Worn 24/7 on the wrist and keeping amazingly accurate time!
It is indeed. I, for one, am surprised at it's accuracy. I know it is going to lose time sooner rather than later, but so far it has been as promised.
The 8500 and 8400 are known for accurate time keeping. My 2254, which has the old 1120 caliber, was regulated at the OMEGA store and now it loses just 0.29 seconds per day rather than 6 seconds like it was before. Still 0 seconds is bloody good! I hope to get an SM300 someday after it is for sale.