Three new iPhone Xs and a watch that's a cleared medical device: That's what Apple announced at its biggest event of the year.

But what does it mean for Apple? Which, if any, of this stuff is worth buying?

Jon Fortt breaks it down with Christina Farr, CNBC.com health reporter who has been breaking stories left and right on Apple's health advancements; Jillian Manus, Silicon Valley venture capitalist, and CNBC tech correspondent Josh Lipton.