As far as rendering in Vue5...times are greatly slower if you choose to use global radiosity/HDRI/global illumination, render times usually run all night, that said the renders come out looking a LOT better, so it's worth the wait. Now if you use a standard atmos...you are good to go. IMHO I would wait for V5 Infinite or go Pro. Vue5 is having difficulties at the moment handling complex scenes....A lot of people can't surpass3-7mil poly count at this point, some are locking up at 800K-1.4mil. OOM problems. That said...V5 is still in it's infancy...and be being upgraded/fixed constantly. So I look forward to it's final state :)