At Atalasoft, we decided to make F# an allowed language for development (in addition to C/C++, C++/CLI, and C#). We make imaging toolkits for .NET. There aren

At Atalasoft, we decided to make F# an allowed language for development (in addition to C/C++, C++/CLI, and C#). We make imaging toolkits for .NET. There aren't many downsides compared to C# -- it's totally interoperable with our code, can be used to implement OO interfaces quite well, and it has some nice advantages (terser syntax, inlining, asynch blocks, etc). The main downside is in dealing with anything that uses Visual Studio Design support. We don't use it for everything, but it has its place.