I have one. I'm switching from a 440 to one of the third-gen 426s, so I have no use of it anymore. I have both the "hidden" and modern style intake manifolds and throttle bodies. I also have an Anderson Ford Motorsport PMS for the system that has never been installed since I decided to switch after I bought it.

Honest opinion:

I didn't like that the Mass-Flo system has ZERO feedback. It does work and it works fine. My dad has one of their systems on his Factory Five Cobra with a 347 and the fact that it works so well is why I bought one. The reason I have the Anderson Ford Motorsport PMS is because it will then give you all the feedback and allow you to tweak things without having to have a chip reprogrammed. I'm sure a great many of you have purchased things and then changed your mind about where your car is going.

If you want pictures of the system or anything else, let me know. If you have more specific questions about the Mass-Flo system, I may be able to answer them.