I ordered this watch yesterday at around 11 P.M., and I recieved the parcel at approx. 6 P.M. today (Prime member/One day shipping) !
So, I opened up the box, and didn't know how to turn on the watch, but there was a booklet... I opened it, and everything was super clear, it said I had to put the USB part of the watch in the plug. Which I did, and it turned on instantly ! (It was already charged, I'd say there was about 75% charge in there already)
Anyways, I tried the watch (bluetooth connection, notifications (calls/texts/fb messenger...), etc.) And for now, everything seems good, and on point ! I am pretty impressed :)