I'm in the prewash camp also. I find that I don't tolerate the chemicals, or frankly the smell of unwashed fabric. I also want to see the actual color of the fabric that I'll be using. Twice, after washing a royal blue piece several times, the color was significantly lighter than the color I was going for. I do wash the quilt again, after it is done. I would hate to have something bleed onto a surrounding piece, and not be able to get it out. Too much time and effort for me to risk it.