I like Alli, and I've never experienced the side effects. The trick is to watch your fat intake. If you eat something that is really fatty, then don't take a pill. For me, I can eat up to about 25-30 grams of fat with an Alli pill without the side effects. But then again, I have crohn's disease that tends to constipation. TMI!!!
Experiment until you find out how much you can safely eat.