Pros:
- It seems to be slightly more accurate
- It takes less time to get an initial GPS fix
- The reported GPS elevation is more accurate
- The barometer response time is much slower
- Screen readability without backlighting is significantly worse
- It can happen that button presses do not register despite tactile feedback
- There is significantly less free space on the internal memory
*) I almost had an orgasm when I plugged the Mini-USB connector into the 65s for the first time.