Open session colonics are not bad at all, in fact, I prefer them to the closed system. There is only so much that will fit down that little tube and if you've got some serious impactions they will feel like you are gonna blow the tube right out! Not fun! Plus there is less crampy feelings with open system because your body is in charge of when to release. They are actually LESS intrusive as far as anyone seeing your body since you insert the tube yourself (and its much smaller than with the closed system) and cover yourself. The open system has a fan located down where everything goes and there is no smell. If you are worried about noises, get over it fast! Your colon-hydrotherapist wouldn't be one if they gave a crap (lol) about that stuff. Besides, with the open system, he or she can leave you alone if you request that...no so with the closed system.