I purchased this product with no particular purpose in mind. The only factor which made me buy this was that I had not upgraded my iPhone and the new ones were too expensive to buy :P.
I have not been a fan of these wearable health tracker devices; and do not confuse yourself, this is a glorified health tracker. It has a tonne of other features like cellular reception, playing music (EarPods required), showing multiple data statistics on screen, watchOS, Siri and yes it does show time :)
I have used it to track my activities, my heart rate occasional calling and I have liked my experience till now. The watch impressed me with the softness of its band, the sapphire back and the almost edge to edge display. It does an exceptional job to keep you active as it prods you; it literally vibrates; if you’re not moving for a long time and urges you to move. Makes you do breathing exercises at regular intervals and after 2 days of regular use, it has started detecting when I am exercising (wrist pumps; where no motion is involved by looking at my heart rate). Having said that, this watch is a luxury not a necessity like all other apple products. Go for the watch only if you have an iPhone (duh) and you want to be surprised by apple.
Product is awesome, but its been 10 days i have not able to pair cellular service with airtel. Airtel is helpless and useless network provider, their customer support dont know how to pair iwatch cellular service with airtel.