I own 2 7dyas (both the newer 5001 caliber version).. both accuracy around +6/+7 per day which still under my tolerance-limit
The good thing is, it gain consistently, daily (i tested it for around 2 weeks when i have nothing better to do)..
I heard can actually send back to regulate to make it more accurate but i just doesn't bother to do so..
to poison u further...
love the brown color strap... problem is, it is difficult to change strap (unlike Panerai) but it save me a lot in buying strap
SC