It took the watch's delivery 7 days. However, there are some places for improvement e.g.
Straps are hard however of good quality. They should be soft to provide comfort
Always on Display needs a little work in terms of Customization.
I haven't used it while performing wudu because I'm not sure if it is safe or not.
I slept from 10.30 PM TO 4.00 AM but my sleep time was not monitored I was wearing watch during this time.
Update: If you want to monitor your sleep time, keep heart sensor on.
However other aspects of this watch are great.