Every developer who has ever used the Android VM should know that testing on it IS NOT a bulletproof test. Sometimes things work on the device which aren't working in the VM even if it is the same version, resolutions and so on. Sometimes things will work in the VM and not on the device.

You don't believe me? Go on and try to stream a video on a Android 1.6 VM.

BTW: I'm developing a iPhone App in my spare times and a Android at work.