Does anyone besides me wonder who came up with the word amaroli? Shouldn't it have been put to better use, like an Italian pastry or something? Maybe that's what they had in mind - they thought if they gave it a nice name, more people would try it. Anyway, Babaly, I've been doing the practice for about 6 months, and without any spectacular results. It's a subtle thing, maybe the most subtle of all the practices we do at AYP. I've worked my way up to about 2 oz. in an 8 oz. glass of water, and have leveled out here. I take it in the morning when I get up, which works best for me b'c then during meditation it can work its way into my system without the distraction of food, drink, or activity. (I'm only assuming that this is a desirable thing - it may be that food, drink, and activity would be beneficial for amaroli).
The only negative effect has been the obvious gross-out factor, but that goes away almost immediately. I recommend not thinking about what you're doing too much, and I highly recommend not doing it in the presence of a friend or lover, or even mentioning that you do this. It doesn't go over well, and they might not let you forget that they know your 'secret'. Seriously - I made the mistake of telling a friend who I thought would be sympathetic, and it's become an ugly point of contention between us.
The benefits are tricky, b'c I can't say that I've experienced any benefits that I know to be a result of amaroli. I'd like to say that I feel brighter and more alert directly after drinking it, but it's inconsistent, and may well be that I'm being affected by another practice. I think I may be doing it on mere faith at the moment, and habit to some extent. It was noted elsewhere on the forum that a forumite's hair and nails were growing faster, which may be the case with me, too.
In short, amaroli's probably not going to change your life, but it's definitely a practice worth experimenting with to see if it works for you.