Since pyramids are illegal, the new format is more of a "root" system. Social networking companies, like MaryKay, PamperedChef, etc use this new system and it is actually more fair to the lower ranks.
Some are better than others. Pampered Chef, Avon, and the like are known to be more maintstream and sort of help housewives make some extra cash. Some of them, like "Team of Destiny" - RUN!!!!! Their parent company Quixtar is actually from Amway - and they are freaks! My brother was in it, and bought it hook, line, and sinker. It's one of those where everyone wears their little mail order suits and starts only hanging out with people from "the business", going to meetings weekly, seminars, and practically worshipping Orin Woodward (the leader). If it looks like one of those types - just run away man.