David I had one and I can tell you the test is a piece of cake. You simply sleep. The prep the night before sort of ties you to the bathroom if you get my drift. I mean you seriously won't be able to leave there. The stuff I drank was a lemony-lime but had a very salty flavor. It was a chore to get it all down. That all said, there is nothing in the world quite like having your doctor tell you afterward that everything looks fine.