Having used Lutz Roeder's .NET Reflector for some ...

Having used Lutz Roeder's .NET Reflector for some time now, I can confidently say that it's an invaluable tool for any .NET developer. The decompilation feature has proven to be particularly useful in understanding legacy codebases and third-party libraries. The user interface is clean and intuitive, and the performance is impressive even with large projects. Highly recommended!