After comparing 3D Delight and Maxwell, as a personal choice, I decided upon Maxwell, anyone in the Softimage community use Maxwell for Softimage? it has improved it's not geared towards Arch as it once was, it's fairly broad, visual effects, animation etc.
Anyone wondering when will Arnold be available for the mass market, don't hold your breath it appears they are strictly focused on big studios, not small studios or individuals. It is a good render, there are areas it needs improvement including caustics.
I have a question for Mr.Blair himself