440 going with efi?

Hey guys so yea, forgot to ad my details on use for the car. It's going to be mostly a street car, maybe a track day every now and then. Roughly 600hp with the trick flows. :-) went to autorama today talk to the guy at the fitech booth, seemed like a quality product. I've heard several good things about the ez efi stuff as well. Has anyone had a bad experience, or is it mostly positive outcomes? Seems like whoever makes the switch doesn't turn back.