I second this. F# is quite IDE friendly, and auto completion works great. Additionally much of the .NET tooling (with the exception of C# specific refactoring t

I second this. F# is quite IDE friendly, and auto completion works great. Additionally much of the .NET tooling (with the exception of C# specific refactoring tools) are CIL / bytecode level and independent of CLR language. This is one of the reasons having a polyglot solution of C# and F# projects is possible and with (mostly) seamless interop - all the same bytecode in the end.