It has been one year that I set the time on my WS200H.
I new right after purchase, that I got lucky with a very accurate one, still I wanted to test and see how well it does within a year.
I wear it two days a week on average and I also swim with it. The rest of the time it is in a dark drawer at room temperature.
Well 'the results are in', please see for your self:(Picture shows W-S200-H-1AV and STW-1000-8JF)
After one full year, it is only 13 seconds behind a freshly synced atomic watch.