I have a basic one- I only glance at it now and then during my ride. I only need the info after the ride to enter onto my training log which I keep in an excel spreadsheet- time, distance, average, max speed, together with my route- actually only the time and distance are important. I would've liked a cadence meter but as I can't afford it i've learned to judge it myself. I ride according to my body. I've noticed that my average has increased with training- been cycling for 6 months. At the start of my ride I decide on the distance OR time of the ride, not both.