Over the years V-Ray has become an industry standard when it comes to rendering, especially the most famous one - V-Ray for 3ds Max.
V-Ray for 3ds Max is full blown production render, supporting both CPU and GPU rendering. It has interactive rendering, progressive rendering, bucket rendering and all of the tools needed to accomplish a state of the art visualization. Its versatile and a great source of inspiration and technical possibilities.
Since V-Ray is used in every CG industry out there, it combines a lot of features and ways to create beautiful visualization.