For years I just used a $20 computer that displayed current speed- Max speed and time elapsed. Then I got a heart monitor that was just a basic heart monotor. Current- highest reached and that was it.

But these basic models weren't good enough for me so I got a Polar HM+cycle computer and then found the main fault I have- Poor eyesight so I couldn't read the thing while riding.

But then I wanted an altimeter- Cadence meter and something that was a bit more Bling and I got a Garmin 305. The cadence meter I rarely set up now- The heart rate and I know when I am working too hard from the way I feel- but the altimeter is good and it does display the current and average speed for a ride-I can download the dat at the end of the ride and It does look good on the bike.

Doesn't work any better than the cheap meter I first bought though.