I use a computer on my main squeeze and I love it. It has helped me ride further, or longer, or even faster, on many an occasion. It helped me get hooked on cycling, and if a perfect ride yields both fun and fitness, the cycle has been a key for me to the fitness part.

I don't have one on my single speed mistress, because I only plan to use her for trips to the gym, library, etc. (and I already tracked the mileage...lol). Plus I don't want anything on the Univega that someone might want to steal. Other than me.