Microsoft Dynamics（Navision）与C＃.NET

I am an experienced C# / .NET developer and recently been offered an opportunity to become Microsoft Dynamics (Navision) developer (training, certification etc will all be paid for by employer). I've never been involved in anything to do with this Dynamics so I wanted to ask what is like to be a Dynamics developer in comparison to C#/.NET developer. I have compiled a list of things that I am interested to know before I make that decision. Please feel free to edit the list.I am an experienced C# / .NET developer and rec