I don't have a problem with polyamory as a concept between concenting adults with good intentions (by that, I mean that I usually don't prosecute an idea in general, more how people behave within that idea). As already said, there is a difference between polyamory and cheating.

With the discussion above about polyamory vs polygamy, I always understood at a polygamous relationship was a purely V type relationship (one man married to two women etc) whereas polyamory was either a V type or more commonly thought of as a triangle situation relationship (where each person has a relationship with the other).

I can see how a polyamorous relationship might be rather difficult to maintain in practice, if two partners become closer and leave one a bit more distant, or if one of the relationships breaks down and makes the entire thing awkward or whatever. If it worked, I'm sure there are more benefits to being in love with more than one person, so that you are surrounded with love and have more loving contact than you might have in a monogamous relationship (like if your partner was working away a lot or something). I'm only imagining here though, since I feel no real appeal towards a romantic relationship of any capacity.