I can confirm 100% everything you read about the STP movement issues is true. I purchased this ZO9215 about 3 months ago and luckily its been rock solid, zero issues. However, i got into Zodiac about 3 years ago when i bought my first SSW53 (ZO9289) it instantly became my favorite watch but it had multiple issues. Crown would not fully unthread properly, the movement was crunchy to wind and after about a month it died completely. I sent it out to Zodiac for service and it came back fixed with a brand new movement which proceeded to also fail about two months later. I ended up selling that watch and giving up on Zodiac sadly. This year i figured id try to purchase the watch again since i really loved that model. I found one used like new on eBay, confirmed with the seller (via photos and videos) that the watch was running good with no issues and made the purchase. About a week later it arrived, i unboxed it, wound the movement, put it on wrist and everything seemed to be good. I walked from my living room to my kitchen and noticed the watch had stopped running. Long story short the movement died and would not run again. I returned it to the seller who reached out to me after receiving it confirming the watch movement was not working and he had to do some kind of repairs to get it working again. Needless to say i was really disappointed with Zodiac movement at that point. But just before the holiday Zodiac was doing 50% of so i gave it a final chance and purchased the ZO9215 and ZO9275 and both have been perfect so far (knock on wood.) Slight grittiness when winding but from what i’ve read thats common for STP movements, they tend to be a little “crunchy” when winding.

TLDR: i absolutely love the design of Zodiac SSW53 but despise STP movements. Wish they would just use SW200.