You can't tell someone that they are better matched than anyone else just because you think they are or because their advertising says they are the best... That is not an accurate way of informing people. I personally can't vouch for five-O, but I can vouch for the other two. FIC and ID are both outstanding injector companies. I personally prefer FIC, but that is because I have personal experience with their customer service, their employees, and their injectors themselves. I have some limited experience with ID's, but not enough to say that one company is better than the other. Dom and I had this discussion not but a few pages back, and we came to an agreement or at least a truce on the fact that FIC does some pretty adequate testing and matching of their injectors.