I have seen many (and I mean MANY) exciting projects come and go, but I do believe that IOU is here to stay because there are no "obvious" flows to the whole thing, you might as well call it "perfect"
I saw several projects with a similar algorithm too. But same it is even good. All of them supplement each other and I think IOU too it will appear in this list.
Their are different and almost thesame project but it does not matter with that. It matter most in the process in which on how to get more earnings and make the project boom for real. That would always depends on the reality that affects the profit of the project.