Unfortunately, even though there is obviously room for more controlled and precise data collection, I don't see much happening to the degree that we can actually make some conclusions. For one thing, unless if you have a Technetics T2, you don't really know exactly what degree and of what type mineralization you're dealing with. Big unfortunate outage there. An individual's perceived depth is also related to hearing and the tones and volumes of the C$ and CZ's are different. I've had a C$ and 2 different CZ's for quite some time and my take is their depths are more "different" than superior or inferior to each other. How many times have folks actually carried around both a C$ and a CZ, checked each and every target detected with both while the other was switched off? I've done that some, but certainly not enough for me to say one is consistantly deeper. IMO, the C$ has better all around "functional" depth (not to be necessarily confused with "raw depth"), in other words, it will hit more targets in conditions that the CZ's handle a little less effectively. I've seen quite a few times where the C$ is still ID'ing a deep fringe target with positive numbers while a CZ has already relegated the target to iron status. That's an example of what I mean with the phrase "functional depth".