Metal Mouth Message Board

Does anyone know anything about these aligners? When i went for my consultation, i told my dentist that price was my biggest concern. He said i could go for invisalign.. or Essix Aligners, which "does exactly the same thing" except Invisalign show's you final results. I tried looking up Essix aligners but can't really find anything about them online. Anyone had experiences using Essix aligners? Pros Cons?

Thanks