It is without a doubt the best $100 you can spend as a .NET developer. The only complaint I have is that it thrashes the disk because VS can't be arsed to make a 64-bit version, and so there's a stupid memory ceiling.
Granted, I just spent about two years doing Java dev in IntelliJ and recently moved back over to working with C#. I'd gotten pretty used to working with IntelliJ so that probably colors my viewpoint a little, but the JetBrains IDEs do have some features I really like - the class structure pane, for example, is really useful.