Done last year, first time, 8 years "past due date." Passed the exam with a clean bill of colon health. I don't remember anything of the actual exam, totally painless.
But those prepping kits are the real racket. $100 (e.g., MoviPrep) and many insurances don't cover them. Before I'm going to spend that kind of mullah on something like that... I'm old fashioned, don't buy gimmicky things or those with fancy names, even more suspicious when connected to medical society, I'm a scientist!
Called the outfit asking for alternatives. They phoned in the second one and nope, that wasn't covered either, but CVS would sell it to me with a coupon for about half price, ~$50. No way!
Called a third time, for a "real alternative," and well and behold they send me to some hidden page on their website with instructions how to do it without a kit: 2 bottles of Magnesium Citrate, one pill of Dulcolax. On to the Dollar Tree: $3 done! $47-97 saved for good beer, later.
I fasted for 2 days before prep day, only had homemade soup (broth) and water. Then on prep day I felt I was "prepared" and amazed how much stuff still came out after drinking those 2 bottles. That was the most unpleasant part of the whole procedure.
Other unpleasantries were filling out and signing a dozen or so electronic forms when checking in while nauseous. Speaking of high-pressured sales tactics!
Then again later when receiving a letter from the insurance company telling me they were NOT going to pay an additional claim put in by the anesthesiologist. And again, another letter stating the same, as the insurance could not find any evidence anything special was done to warrant such a claim. Greedy doctors! See you again in 10 years, hopefully.