I have started using the Messagepack Serializer for C# with VB.NET because it is very fast but mostly because it is well-maintained with frequent releases.
It works well with VB.NET and haven't run in to any issues yet, but I wonder if there are issues that can be expected with VB.NET as it is so specifically called Messagepack Serializer for C# not Messagepack Serializer for .NET.
Thank you for sharing your insights!