Steve, I've grown both--feminised seeds and "regular" seeds where I had to remove the male plants. There was no difference in the quality of the bud. When you buy seeds from these master breeders these days, you're getting top notch genetics. I have no idea on what basis your friend makes that claim: it sounds subjective and I'll bet he has no scientific evidence--i.e., repeated growing of one chemovar, say Dutch Passion White Widow, growing both regular and fem., and then having chemical analysis done. Sounds like opinion to me--not fact.