The Master Hunter 7 ADS from memory is a good oldie.
The GB All metal is capable of excellent depth in most ground conditions although not so flash over wet salt beach sand.
The Disc Mode does not ground balance which means this mode will not achieve good depth in iron mineralisation and will require the coil to be kept at a constant hight above the ground.
I believe the meter displays target ID in the All metal mode.....I am open to correction on this as it is a long time since I used one of these detectors and the memory may be a bit dodgy now.
Just a bit of info dragged up from my dim dark memory banks.