It seems that "smart" devices mostly give some data brain crack to feed upon rather than improve the actual outcome of any activity. When I got the Muse headband for measuring brain activity during meditation, it was fun at first, but it didn't affect my meditation schedule. Before and after, my plan was always to just meditate more. I sold it shortly.

Similar with 23andme. Lots of personalized trivia about my genetics but nothing earth shattering or really actionable. It told me my race (whoa my parents weren't lying to me) and said I had slightly above/below average risk for many obscure diseases. Maybe it'll be more useful with gene tailored treatments some day.