I just did one the other day. Coffee enemas usually help my feeling of well being a bit and doctors know i have liver issues so i decided to try it.
I couldn't do it 100% because i have pretty bad hypoglycaemia and cant go nearly that long without eating so i peppered in a couple salads and some hummus where i had to.
I'll be honest, after drinking the olive oil/grapefruit potion i got pretty sick. Not sure if it's because I'd eaten a few hours prior or something else but i woke up after an hour and spent the next few throwing up, shivering and feeling very nauseous as well as throwing up again any time i rolled onto my stomach. I had diarrhea the next day but didn't see any stones or anything unusual nor did i feel any different.
I don't care about feeling like shit if its something that will help if i keep doing it. I may wait a couple weeks and try it again to see if i get anywhere. I'd be interested to see if anyone else has success with it