Finally, a proper C# IDE on not-Windows. I've been working with ASP.NET 5 on Linux for the last year and Sublime, Atom, VSCode, etc. are all painful. Sublime is surely dead, and anything based on Electron kills my 2-core CPU and my battery. I was in the talk here at NDC London where they demo'd Rider, and I can confirm that it is very fast and he showed the Mac process view and it was barely hitting the CPU, even with a JVM and a Mono VM running. And when it's all running on .NET Core it should be even faster.
Great days.