I've taken it a few times, and because in the UK you're told to eat low residue foods the day before the prep, not much tends to come out! The prep has always worked fine for me and they can get a clear view inside. Good luck.
Diagnosed with Crohn's disease in Sept 05 aged 24
Resection in Nov 06
Currently taking 125mg azathioprine, 40mg prednisolone, multivitamin, probiotics and omega 3
Previously taken Entocort, Flagyl, Cipro, Pentasa