Android Multiple Device Development

I am new to programming in general and have been teaching myself using Android SDK in Eclipse. Lately I have had a lot of iPhone developers telling me to ditch Android and go to iPhone because it is simply too hard to develop for the whole spectrum of Android devices.

When I look at the dev guide, I see a page about developing for multiple screens, and it seems pretty straight forward.

Has anyone had a hard time developing for multiple devices on the Android platform?