I have had 10+ colonoscopies and tried almost every prep, I found this Movieprep at a crohn's seminar/expo. I was thrilled as it seemed to be a huge change from the other preps out there. I tried it and I was dissapointed as I have lots of missing parts due to resection sugery and I just can not consume the large level of liquid that most preps require, the Movieprep says that you use less of the nasty prep solution, but it is deceptive as it amounts to almost the same as colitly. I did the Movieprep anyway, the Dr. said my prep results were far from being cleaned, and almost did not do the test.
I found out for myself that if I know I am going for a colonoscopy I eat minimal amouts of solids even days before the prep, my thought is less in than less to clean out, I end up needing less of the prep solution to get the job done, I just check the outcome in the bowl while doing the prep, when it's clear and no particals I stop drinking the prep, it cuts the intake down to about 1/2 to 3/4ths, hope this helps.
P.S. Nice to feel that you can speak openly about this kind of stuff here as most people are grossed out if you tell them what your doing.