In response to some of the ?. On the 3D.,If you picked up a handful of dirt and had Disc.at 0 in salt mode you will get signals. you have to run at least 2. Now thats in the red clay in Virginia. Now We are all from Ohio, if you go to an old 150 year old farm house ,Fisher says to use the inhanced mode,well it aint happening, if a farm house is 150 years old there is a lot of trash around. you will be digging a lot of signals, just dig everything anyway and you dont need the inhanced. The CZ21 will do the same thing. 4 men with over 75 years of experience cant be too wrong .Now the 3D is a good unit, dont get me wrong,but it is heavy,if you are going out for 10 hours or less it has to be hip mounted. Now the nobs are designed so loose that ground balance, sensitivity are always moving, not a good thing. If you dont use headphones, a lot of dirt will get in the speaker jack. You must constantly tighten the set screws on the nobs, or you will lose them That has happened on 3 machines already.Its a good machine, but there are better designed ones.