The other day I found a comparison done by some university students between Vray for Sketchup and Artlantis. I can tell you there was no noticeable difference between them. I wasted 6 months of my life in vray, so I would recommend Artlantis anytime.
Call me shallow, but I prefer a good graphic interface, an on the spot light control and live preview with materials, from a spotless render that can take hours of fiddling with small number and senseless parameter handling, to create...
I'm an architect and I want immediate good results for my presentations and the package Sketchup+Artlantis delivers those results just fine.
If only artlantis had a better bump control and displacement...
P.S. Great job there! where did you get those 3d people they look great (although the girl IS on the edge of her sit...)