Sometimes less is more. Sometimes we don't need to have a smartphone attached to our bars telling us when to ride hard or when we need to fuel. There are critical pieces of information that are nice to know though like heart rate, speed, power, and maybe Strava segment time.
Crystal clear display; Lightweight; Long battery life; Ride description functionality; Live Strava segments
Lacking in power features; GPS in monochrome can be hard to follow; Expensive