I bought myself a Christmas present last year. It was a smart watch. It's not a high end model. I just wanted to see what the buzz was all about. I had no desire to track my steps, or the amount of time I sleep. I didn't synch it with my phone so I could receive messages on my wrist. I was looking forward to checking my route and mileage during biking season.
I should add that it's a darn fine watch, with nice big numbers.
When I sat down and thought about it, it was a waste of money. I usually take the same route, and I already had a rough idea of that mileage.
Then, a funny thing happened. I found myself varying my route a little with each excursion-- just to test the sensitivity of the watch, checking to see how far it is from here to there, and the time I needed to do it. The watch has brought me a great deal of enjoyment, and it's added to my biking routine.
An unexpected benefit!
By the way, I do most of my biking in the dark. As noted earlier, my bike has lights, a full set of reflectors, and I wear a reflective vest. I showed Joe Snedeker the make and model of light I use. Joe didn't think it was adequate, and he let me borrow one of his. Holy cow! It makes my route look like a night game at Yankee Stadium. Thanks, Joe!