I have used the 205 for 2 and half years and am on the third one. Garmin replaced the first one free after 14 months but the next time (15 months later) I had to pay $69.I use the 205 as a speedometer and wear a Forerunner 305. Over a 30 mile ride the difference between the two is about .23 miles with the 205 registering more. The 205 is also more generous in computing average speed.
I haven't had any issues with the batteries but then I only ride for 90 minutes per day and then put it back on the charger.
The altitude is definitely wrong. I live in Florida and the highest point I ride up is a bridge that may be 20 feet in change. At the end of the ride it shows an elevation change of 50-70 feet up and down with a net change of 3 feet.Garmin Edge 205 GPS-Enabled Cycling Computer
