Cycle computers are one of those bike accessories you can live without BUT eventually your leisurely weekend ride or commute to work becomes more of a hobby, or better yet, a passion, dare I say, addiction and you're curious about the increased miles, the distance you're now achieving, or the new routes you're taking and wondering what is on the other side of that hill. Depending on your curiosities and needs, you may want to log your distance and performance to review speed, fitness and personal goals, or you may want to extend your adventures further and have a mapped route with navigation.
Whatever your curiosities there is a computer for you and your rides. With mid-range and above computers, you have the option to sync and share your rides on numerous fitness social networks that log and store your achievements, such as Strava, Garmin connect or Cateye Atlas, which also give you the option to view other peoples rides, routes and rankings for that competitive spirit.
Whether you opt for an entry level or advanced computer, it will enhance how and where you ride as well as your motivation.