62yo here. I use all of the features! Heart Rate (if it goes to zero, well . . .), cadence, so I don't over-spin on hills, GPS so I can find my way home when I get lost and the sun starts to go down, headlight/taillight control, and rear radar interface so I can see the car trying to rear end me. AND it talks to my DI2 to tell me what gear I'm in without looking back at the cassette. Yeah, it's all cool as long as I charge all the bits :>).