Erlik - The 4 obj files I used in my piece ranged from 2mb to 13mb & the resulting Bryce file (which included a few other imported models) was a little over 50mb. XenoDream's export function does have several controls that allow you to optimize the size, but I haven't played with them yet. As for the utility of the models, if you're interested primarily in realism, I would agree that they probably wouldn't be very useful. Personally, I have absolutely no interest in realism - I create only internal landscapes, so for me it's an effective & unique tool in my arsenal...

"Every child is an artist. The problem is how to remain an artist once we grow up." - Picasso