CZ70 & C$ both will hit a dime at about 10-11" fresh buried. But thats here in central Florida, others may experience more or less depth depending on their soil conditions. The CZ70 & C$ are about equal in depth. I think they each have their benefits, the CZ5 is an all around coin machine and one of the best. The CZ3d however is a good coin machine for older sites, but newer trashy sites, I would opt for a CZ5 or the CZ70. Now, the CZ70 is a great all around machine and one of my all time favorites, great for relics, coins & beach hunting and I like the notching system of the 70 plus I just like digital. Now the C$, is one of the best relic machines going, what little have done with it has really impressed me. The C$ is one of those machine that you can use in places that you can't use a CZ.
As an example, I have tried hunting around railroad tracks with the CZ's and they go nuts anywhere near 10 feet of the tracks, but not the C$, it will hunt almost up to the tracks without much of a problem. But then electrical interference will cause problems with the C$, but not bother the CZ's so its really a catch 22 I guess.