This isn’t a real product yet, but if apple were to come out with it, I imagine it being rather successful for several reasons. 

1. Apple customers are often committed to the brand so if a new apple product were to come out, many customers would buy one sooner or later
2. Its convenient: rather than having to take your phone out of your product or purse every two seconds, you get your notifications on your wrist
3. It looks good: Its a sleek design and even though its digital, its not bulky at all