[jakehow]

Had the same experience with Appcelerator. Not knowing Objective-C it was a lot easier to get ideas into code quickly for prototyping, but when I ended up having to read all of their source and writing custom modules to get what I wanted done I decided it was not worth it. (Side benefit: this is how I got comfortable w/ Objective-C)

If your app is brochureware or a simple web app port to mobile it probably works well. If you are pushing anywhere on the edges it starts to get difficult.

Organize your application really well and it will be easy to port between the two platforms for any models/libraries you write where the concepts are the same.