I have been using a proxy Dreadsaurian and found it to be awesome, specifically in Thunder Lizards. I never see it around and I'm guessing the main reason is it's impossible to find, costs a fortune and doesn't come with a base. Those are good reasons to not buy one but they aren't good reasons not to use it if you could. The main complaint I hear is that the base is way to big to maneuver, this is true but the size has major pro's too. It can screen entire objectives and can reach far into the table while most of the time still staying within 1" of mystical terrain for the 6+ ward save. The large base can also block enemy units from buffing units that run behind it, like EOTG heal or Slann +2 to spell/ability shrug.
Just interested on your thoughts.
Just interested on your thoughts.