.Net Core with IRIS as DB

Hi guys,

I'm starting few POCs to test InterSystems IRIS with a .Net core backend of an API Gateway and I have few questions about this integration.

• Which .Net library is the oficial? 
  • I found at least 3 options: packages from nuget website (https://www.nuget.org/profiles/InterSystemsCorporation - that I couldn't do them work), packages “IRISProviderCore.1.0.0.nupkg” and “IRISXEPCore.1.0.0.nupkg” inside “IRIS\dev\dotnet\bin\CorePackages” (Iris installation folder) and libs “InterSystems.Data.IRISClient.dll” and “InterSystems.Data.XEP.dll” at github sample project (https://github.com/intersystems/stock-trading-with-dotnet-isc1134).
• How can we check for updates to these libraries (if nuget isn't the official source)?
• Do you have any performance benchmark results (maybe comparing Native COS, Java and .Net performance)?