The question is: how much of the dross have you seen. I could easily say "every painting in oil I've ever seen was great" but that wouldn't make me a great painter. Or that I should go and buy oil paint. UF is a tool. Like a lot of other tools. You like it or not. You learn how to use it or not. It helps you create great art. Or not. If it is useful or fun, I think it's well worth the money -- if it is neither, I see no reason to spend money on it. Then again, the same can be said for every product out there (even the ones that don't cost money still cost time and effort and energy). I tend to think of "evaluation versions" of programs like this: for six bucks I can go to the movies and be entertained for an hour and a half. Maybe two. If I get more than ten hours of entertainment out of something that costs $30 or $40 then it's worth it. If I spend more than three or four full days being entertained by something then it's certainly worth $50.