I've had one, and it was pretty much a non-event. The procedure takes about 15 minutes, they give you a sedative as a rule and I don't remember a thing. The prep was interesting, you need to hang around the house for that one, and the really good thing about getting a colonoscopy done is that they can clip off little future problem spots, affording you the likely ability to avoid colon cancer and the potentially major surgery that entails. I was also told the 5 year interval.
So you see, it's kind of like car care, you can do preventative maintenance, or you can do major repairs (that may or may not work) later. I like to avoid problems, don't you? It's always easier and cheaper to avoid trouble than to get out of it later...... Lynn