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Pro New C# IDE based on ReSharper and the IntelliJ platform
ReSharper is a popular Visual Studio Extension for .NET Developers. IntelliJ IDEA is a popular and fully featured JAVA IDE.
Pro Multiple runtime support
Project Rider supports the .NET Framework and Mono, with CoreCLR support in the works. It also includes templates for creating new projects, and when you create an empty project, it's literally empty
As well as running and debugging multiple runtimes, Project Rider itself runs on multiple platforms. It runs on Windows, Mac OS X, and Linux.
Pro Supports all the development lifecycle
Project Rider can build MSBuild and XBuild solutions as well as DNX/.NET CLI projects, and allows debugging .NET and Mono applications. DNX/.NET CLI debugging and CoreCLR support are coming.
Pro Superior "quality of life" features
Extremely good at filling in all the mindless boilerplate type code while you stay productive.
Con Relatively young project
Some bugs are to be expected since it's still a relatively young project.