I've also used Xamarin to develop for both Android and iOS, and I found it to be a good experience. The tools deliver what they promise, in my opinion. Built ap

I've also used Xamarin to develop for both Android and iOS, and I found it to be a good experience. The tools deliver what they promise, in my opinion. Built application look and feel like full native apps. I don't want to repeat the comments made by others, but one other other thing that impressed me was being able to compile c# code into a portable class library dll on windows, then just copy the binary to a macbook and link it into my iOS app project. Very cool code reuse. Not knowing ObjC made getting started on iOS harder than it could have been because examples tend to be in ObjC - although Xamarin have some useful snippets and recipes on their site. Android was easy because of the similarity between Java and C#. You still need to learn the platform APIs, obviously. Its been some time since I felt so positive about a new piece of developer-orientated technology. Definitely recommended.