I like curve machining capability on NX CAM. It gives you more flexibility to generate tool path using 2D or 3D curves( milling or Turining or even drilling. NO need to create 3D models where it does not add any value. Also many times 3D models are not available for certein types of jobs or situations where NC programmer need to deliver NC codes to shop floor without waiting for 3D models and just using CURVES !!!!