One additional selling point of ReSharper to me has been the embedded continuous learning enabled by it. Almost every time a new language feature is introduced, it is ReSharper that shows me how and when to use them, using suggestions in my existing codebase. I especially like how they are able to translate several nested foreachs and ifs into one line LINQ statement - and back again. This ability was instrumental for me to really become fluent in LINQ. This level of code analysis and refactoring is something we just don't see yet in Visual Studio.