You know the easy way to figure out how hard a program is to run is think up a test scene like underwater with fishies say and try to make that one scene in every app. That gives you a good yard stick to measure with. May be not underwater but you get the idea. One project not something default. Include at least one mesh that has to be imported and textured. Ya one thing World Builder is a incredibly powerfull app but By looking at the gallery for it it becomes very apperent that few have mastered it. That's the way I judge software BTW. I just go to the galleries and see what real people create with it. Not the sofware company hired expert artists, just regular people like you and me. I look at the quality and the quantity of the good stuff. Is there lots of good stuff from lots of different people? If there is chances are it's a fine easy to use program. It's a real eye opener.