Is Xamarin cross platform device mobile app production the way to go?

I have found Xamarin cross-platform, mobile device IDE
It seems to be real, working for every device type, Android, iOs ..iPhone, Windows

As introduced by this dude here

The coding is apparently done in Visual Studio? for C#   I'll need to rent the latest version, or get my client to pay rent for it.
I still have Vis Studio from mid 90's - CS 455 days  If I rent the Mac version of Windows.Visual.Studio, will that be foolish, for an app development on a MacBook?

Anyway, this is apparently a good solution for cross-platform PDA development. Is the interpreter set for Tablets, also?
Would you agree? Hackable? crashing problems?

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Jackie ManIT ManagerCommented:
Anyway, this is apparently a good solution for cross-platform PDA development. Is the interpreter set for Tablets, also?

You are correct. But, there is hidden cost.

Whenever there is an update of the mobile OS and if your developed apps have a problem, it will be costly to do troubleshooting.

Would you agree? Hackable? crashing problems?

It depends on what apps are developed. If it is only an information app with link to database in cloud and you have followed the rules of different mobile OS, you need not worry a lot.

I am not an app developer and the above is only the findings from my research of your question.

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