We've installed two systems using EZ-EFI, one on an Inglese individual runner setup on a ZZ4 crate motor, the other a TBI setup on the owner's ZZ502 crate motor. We never got either to run satisfactorily from our point of view, the Inglese barely acceptable, the ZZ502 virtually undriveable with a flat spot the size of the Grand Canyon. No amount of consultation with FAST seemed to help.
I think both of these could be considered more "edge cases", which may account for why other folks seem to be quite happy with EZ-EFI. Still, at this point I don't trust any of these systems that are "self tune only", with no laptop or other manual override programming available.
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