the quality is much better on the DVDs the quality of the downloads is less than the dvds but i would still think they were better than the quality of that

I used to use turtle to get quick previews that would be similar to Mental Rays output, then I started finding errors and the overall look of the image was slightly lower qaulity than you would get with Mental Ray, The final images that you see in the ferrari video areas are turtle renders but only because of a problem I was having with the light geomertry. Personally I would now go with Mental Ray everytime