[dgudkov]

We use both C# and F# in our application, using C# for UI (WPF) and F# for data processing with a lot of calls from C# to F# and vice verse. Using F# was crucial, because it allowed writing heavy processing and complex algorithms (e.g. parallel hash aggregation) in a very clean and concise way with higher-level abstractions which saved us a lot of time. Things like not having to deal with null reference exceptions were also a big time-saver. Without F# it would have taken us one more year to release a production-ready application, or even made it impossible at all given the time & budget constrains that we had. If I ever start another project of that scale I will do it using only F#.