I haven't yet had this watch a week but I love it.
THE PROS:
I have a Samsung watch which is enormous and which runs out of batteries every 2-3 days. This one is very thin and does not stand out much from my arm like the Samsung. It doesn't do quite everything the bigger watch can do, though it does plenty.
I found two faces that do everything I want (Time, Day of Week, Date, Weather, Battery, steps, & Heart-Rate), though these are both digital and I prefer analog. The battery seems to lose roughly 1%-2% per day, which is fantastic compared to what I am used to.
THE CONS:
The watch band it comes with is unusable - plan to buy one and figure it into the cost of the watch. I found a magnetic mesh band which I like. I am not a fan of having to install software on my phone to operate a watch but so far I haven't regretted it.
There aren't clear instructions but with a little time and determination it is possible to make this into a fantastic watch.