just to say-  iirc, geometry switching loads all the referenced objects at once.  that's why it's quicker (after loading) than, say, just replacing the figure with another from the library.  basically, it replaces the functionality of the library.  so i think you should think when you plan to use it you should think about how it would actually get used.  if something isn't switched often when developing a scene, such as UV mapping, it may not be worth the resources to load the obj(s) you won't use and deal with the general complexity and general bugginess i've seen in geometry switching products.  conversely, if it's something a person might switch frequently (such as hair styles, or styles of shoes), it might be worth it.  personally, i'd rather not have my system bogged down with stuff i'm not using, but that's me.