I'm coming from VRay for Cinema, and while that implantation was not nearly as complete as the one in Max, it is quite workable. I also assumed that there would be some interoperability between VRay and Corona but it seems like that assumptions was wrong. It looks like Max users have created some scrips(as always) to fill in the gaps for VRay to Corona or the other way around. The lack of even a material converter(the scene converter isn't suitable much of the time) is quite painful - big red "unsupported" everywhere, just as a reminder. It seems like Corona and VRay are much more segregated than I thought despite being part of the same company. Of course now I feel like my VRay assets are useless in Corona so I need to start re-thinking whether this will work.
Regardless, I guess I will continue to use VRayProxy in Corona until it proves unreliable.