Mine worked fine when I first got it, but it stopped working a few hours later. I figured it just needed a good shake, and sure enough, it started right up. Over the next few months, it would occasionally hiccup like that, but after I gave it a shake, it would start again. When I first got it, it kept extremely accurate time (less than +5 secs per week, according to my atomic clock app), but as time went on (ha!), it got progressively worse, until I was losing 8 minutes a week. And 9 mos later, it stopped for good, and no amount of shaking would start it back up. Extremely disappointed, I wish I had read the reviews and seen that this particular seller/watch has had QC issues. Based on this experience, I'm looking for an SKX007J from a different seller.

For those who get a good copy, I'm sure it's a great watch, just a note of caution for those looking here.