For all 3D artists using 3ds Max and/or Cinema 4D. You will get instant benefits.
If you are a 3ds Max user you can add a new dimension to your workflow sending your scenes to Cinema 4D to use the fast advanced render there, or the library of objects, or the amazing hair/grass integrated system, etc
If you are a Cinema 4D you can sometimes prefer to model inside 3ds Max for specific tools, or because you have models already done there, or because you have purchased some models in the past in .max format (arch models etc) and you want them inside a current Cinema 4D project in a fast way.