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Pro Nice for NDK development as it abstracts platform level differences
Pro Easy to port and iOS app into Apportable with minimal effort
Apportable offers a compatibility layer which emulates Foundation, UIKit and OpenGL ES layer. Since the middleware is very configurable, it's very easy to port and iOS app into Apportable middleware with minimal effort.
Pro Allows using Objective-C 2.0 and Xcode for Android projects
You can use Objective-C instead of the NDK for Android projects.
Con Small API coverage for UIKit
Although UIKit is supported, the API coverage is pretty small. But what part of the API is covered, generally works well.
Con Xcode support is behind
They're still targeting Xcode 4.x, and Xcode 5.x support is still experimental. This is somewhat against Apple's policy that pushing developers to use only the most recent Xcode.