I hate to be that guy, but the George Daniel's coaxial escapement was more of a marketing gimmick Omega felt they needed at the time.
A lot of people in the company didn't want to use the new escapement, but they needed a new selling point. Plus--why fix something that isn't broken? Their watches seldom need to be opened for at least ten years. I have a Omega Constellation, with the standard escapement, that hasent been opened in 15 plus years, and keeps time within seconds per day.
Many of the coaxial escapements had problems. It's not clear why. I believe the problems were watches produced on the first run?
I have an Omega with the coaxial, and many with standard escapement. My coaxial keeps the same time as the my other Omegas. Actually, it's not as accurate. I hate to say this because it's a $3500 watch.
The jury is still out on wether the coaxial escapement is any better than a standard two jewel pallet fork. The coaxial has three jewels, and a unconventional pallet fork.
In fact, their are guys like myself, who actively seek out Seamasters without the coaxial escapement.
My point is different, more complex isn't necessarily better. Sometimes the new design just adds more failure points to a movement. The coaxial escapement hasen't been around long enough to claim superiority. As to repairability, it's definetly more work to service. Why--Omega keeps its service manuals locked away, like all the rest of the high end watch companies. In the end, they want you to send in that watch to the factory when the time comes, and you will be charged factory prices for a wash, oil, and buffing. You will receive a fat ding on your credit card for that service.
In the long run, when you can't take a watch to whomever you want for repair/parts; you really don't own said watch. You are essentially leasing the watch. Again--you buy a Omega with your hard earned money. Even if you have the skills to work on the watch, you can't call up Omega and order a spare anything. They will politely tell you to take it back to the overpriced boutique, and they will send it in, and you will pay through the nose.
I'm tired now of writing. I do like George Daniels though. I wish someone would do an autobiography on the man.
A couple more things about watches, and their subsequent service. Service it when it stops working, or doesn't keep the correct time. If it's in the water, you need to have it serviced at their intervals. Buy a demagnitizer. And I forgot the other thing I was going to say. Anyways, for the money, you can't go wrong with any Omega--vintage, or new. I've looked at new/old Rolexes, and Omegas under a microscope, and I can't tell a difference in quality of parts, or engineering.