I think what most people are talking about is either all the shed coming off in one or a few peices. If you're bps shed is coming off really patchy then your humidity is off. All of my bps are in tubs and since I switched over to tubs I've never had another bad shed. All of their sheds come off in one or two peices. Mostly it's one and they look like big condoms. Excuse the expression. But that's what I refer to as a perfect shed. A good shed really is If they can get it off in one sitting. They will roll it off of themselves. But it doesn't happen everytime. And it's no big deal if it doesn't come off all at once. Some will also prefer to rub it off on cage decor so it will come off in big peices.