F. A. S. T. system, has anyone used them?

FASTMANS is where I have been doing all my research, and the EZ2 is what cough my eye, especially since it works with E85. But, the EZ2 is not compatible with boost. If I ever wanted to add boost to it, I wouldnt want to have a system that would not work with boost, that I spent a good chunk of change on. The only thing that scares me about the XFI is that it will take a lot more time to program and testing to see what works. 76orangewagon, how user friendly is the XFI system? Oh and thanks for the pics, the duel 4s look awesome!!!!!