Well, I serviced a Mk XV some years ago (ETA 2892 based movement) and it had been back to IWC twice. What I found was work sloppy enough that I question if the person doing it had ever been formally trained. To give you just some idea of how bad things were, these are shots of the inner anti-magnetic cover...
If it's not obvious, there should not be fingerprints on these parts, so maybe IWC doesn't issue finger cots to their watchmakers...
In any case, a watch that didn't work right from the day it was purchased from what the owner told me, and had been back twice for service to IWC and still wasn't right, worked fine after I serviced it. And to be clear I didn't do anything special - I just gave it a proper routine service, and it worked great.
So I'm not so sure the cause of any service problems are really because the movement, but maybe the watchmakers they hire for their service centers.
One thing to consider on the ETA (now Sellita) based watches, is that there are some pretty convincing fakes out there. I've had one in my shop and it didn't have the normal set of tells on the dial - it came down to the movement. So the JLC based watch is less likely to be a fake if you can get a shot of the movement. Just one other thing to think about.
Cheers, Al
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