I have a powermatic 80 in my diver and it's been flawless for the past year or so. Great power reserve and off by less than a second a day. It's a bummer that the movement can't be serviced. I think the safest thing to do is save the donor watch so you can always send it back for warranty repair. If it makes you feel any better this won't be much of an issue moving forward since it seems like most factories are moving away from the A2824 movement.