Här är ett inlägg C Vail (ägaren av NTH) nyligen skrev på WUS. Jag skulle inte likställa Miyota med ex ETA men verken har nu funnits i över 10 år och jag gar inte hört många klagomål.
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Inlägg WUS
Manufacturer here. And author of the post linked above, about disposable movements.
So...all our data so far is anecdotal, but I think reasonable people can use it to draw some valid logical conclusions.
First - the movement debuted in 2009-2010, so, it's been around more than a decade now. If people were finding that the movements started to require servicing in under a decade, I'd think we'd know it by now. More likely, the vast majority of those in circulation are still in service, since we haven't been hearing lots of stories about problems popping up.
Second - our experience with them, after using over 6,000 units, is that maybe 1 in 1,000 (or at most, 1 in 500) will just be a dud, and need to be replaced. It usually seems to happen soon after delivery, within the first few months of ownership. But it's certainly possible that there are some which manage to evade discovery longer than that. We just haven't noticed any such issues. That experience is mirrored by what we've heard from other brands, and our vendors.
Overall, we've been very impressed with them. They're well-designed, well-made, good-performing movements.
We can't "prove" that they'll run for decades without issue, but we believe they will. Part of the reason is the above - the performance we've seen from them so far, and their obvious quality. The other part is based on looking at other Japanese workhorse movements, and their longevity. There are many watches with Seiko and Miyota movements from the 70's-80's which are still running and keeping good time, without ever having been serviced.
But, if we're strictly dealing with what we know to be true, not what we believe will be proven true, fine. We know that a replacement unit can be readily purchased for about $100-$120, depending on where you get it.
A watchmaker might charge you a bit more to source it himself and drop it in. But you're probably looking at ~$200, all-in. That's likely to be less than you'd pay to have a Swiss movement serviced. And the Miyota will be less likely to need replacement within the time that a Swiss movement will need servicing, based on our experience with the movement, and what's been confirmed by other brands and our vendors.
Hope that helps.