Vray for 3dsMax has a superior micropoly displacement and very accurate true DOF built in. Plus it renders GI with irradience map, and is about 3 times faster than Mental Ray and twice as fast as Brazil. There's no comparing FireFly or 3Delight to either Brazil or Vray. Caustics, true DOF, micropoly displacement with soon to be unlimited resolution capability, true caustics and motion blur are just some of the things that stand heads and tails above these lower end renderers. The most important is the speed, because without that, GI is virtually useless in a production environment, and animation NEEDS speed. Also, network rendering is something you can't do with Poser or this Daz program effectively here either. So it's useless to professionals. There's TONS of things that you can't do with Firefly or this Daz thing that you need for true realism and professional productivity. Subsurface Scattering, light disbursment, mat materials for seamless compositing of CG with real life scenes, true HDRI, translucency WITH fog color, true refraction with IOR values, and not to mention rendering to fields, etc. Shall I continue? Multiple shader types like Oren-Nayer-Blinn, Aniostropic reflections, GLOSSY reflections, etc. etc. etc. ;-)