title: has_and_belongs_to_many in Rails
body: <p>Is there anything explicitly wrong with using has_and_belongs_to_many associations in rails instead of has_many :through?  I'm aware of <a href="http://blog.hasmanythrough.com/2006/4/20/many-to-many-dance-off" rel="noreferrer">these</a> <a href="http://blog.hasmanythrough.com/2006/4/17/join-models-not-proxy-collections" rel="noreferrer">articles</a> <a href="http://blog.hasmanythrough.com/2006/08/19/magic-join-model-creation" rel="noreferrer">describing</a> differences and work arounds, but they are from 2006.  From things I've read on SO, it seems like people think that habtm is old and clunky, but what if a simple many to many join with no model necessary is what you're looking for?</p>
  
  <p>Thoughts?</p>