when a project enters an IEO there still a big possibility that the project will fail. its not guaranteed.. the good thing about this initial exchange offering is the security that the project is already in exchange..
That's only the thing that can be taken by the IEO investors to make sure if their project will be listed on the exchange site instantly. So many times people have already started to say this and IEO is the same as ico but with the listing guarantee that will bring the hype.