One of the reasons is that you do not have to pull your iPhone out of your pocket to see who is messaging you or calling, or to answer a message or even to answer a call. My girlfriend was always missing calls on her iPhone because hers was always buried in her purse and by the time she got everything unzipped and the iPhone found, the call was timed out, only to find she didn't need to answer it anyway. Or, alternately she was digging her iPhone out for a junk message that was worthless, wasting her time. Now with a glance, she can see she can ignore the call or message.
On silent mode, in meetings, I can just glance at my Apple Watch and get important update messages with no one being the wiser. I am alerted by a quiet tap on my wrist.
You can, as I said, answer and initiate phone calls on your Apple Watch, reply to messages by dictating your replies through SIRI (quite accurately), or select from pre-canned answers for quick responses.
With SIRI, I can ask any question and get an answer, again, without digging out my iPhone, merely by saying "Hey, Siri" and then asking the question.
The Apple Watch can keep track of your exercising, remind you to keep up with exercising, track your health, paces while walking, running, heart rate. etc.
The Apple Watch can direct you using Apple Maps to any destination while walking using subtle taps on your wrist that only you can feel, telling you when to turn and which direction. In addition, you can have the Apple Watch alert you to sales and bargains available nearby, should you choose, from restaurants and other stores, through Group-on, and other services.
I use my Apple Watch frequently to pay for many things with Apple Pay, which requires a single push of a button and merely passing the Watch near the NFC active credit card machine. Again, I do not have to fish my iPhone out of my pocket to pay, or dig a credit or debit card out of my wallet to do it. . . and it is far more secure than using the credit or debit card. If someone were to remove the Watch from my wrist, that feature will no longer work. In fact none of them will.
As a watch, it is far more accurate than any i have ever owned, being time set by the atomic clock at the US Navel Observatory.
I can use it to control my Apple TV, my regular TV, changing volume, stations, etc. . . and as a remote shutter release for my iPhone's camera/video recorder for those rare occasions where i wish to take photos/videos of myself with my family and also be in the photo/video and not be behind the camera. I can control iTunes playback of either recorded or streaming content from my Watch.
I have instant access to my Alarm system at my house and work, and can reset either as required.
My calendar is available to me at a glance and I can add appointments as required easily. . . and I can set reminders including GPS type reminders such as "Remind me when I get to work to do X" and it will do it, knowing when I walk through the door at work because it's linked to the GPS on my iPhone.
You can pretty much customize the watch face to include whatever complications you want on the dial. . .
Battery life has been sufficient for me to get through an entire day, and has, on occasion gone two days before recharging, on reasonably heavy use.
Thanks for the indepth response/review. I really wouldn’t have a need for the all the cool tricks the gadget can do.
But it seems as if some people spend a whole lot more time on the phone than I do!