You know, I'm partially just trying to keep this Quatro site alive here, but honest to God, I am in complete agreement with all the posts above in response to redusmit's original post about Quatro verus extera, and all the problems he's been having. Redusmit, or any one else who is disgrunteled with the Quatro, my hand is on the Bible on this one,,,,,,,. THIS IS ONE OF THE FINEST DETECOTRS THAT MONEY CAN BUY. I swear, that in the hands of a good detectorist, like Golden, I'd put it up against any Explorer, or DFX, or any other detector in the world, and I'll bet it would either keep up with them or in the case of the Explorer, maybe fall behind a little (only because the Explorer has two numeric readings), but I'll bet they'd be neck in neck or in many cases the Quatro would beat them hands down. Even from my own semi-limited experience, this is one hell of a detector. I've found a penny one time in wet beach sand at 1 foot deep. It discriminates very acuratly between different metals, many times to within a few numbers of the stated numeric reading. It is very accurate on coin sized objects as far as depth reading, and I've had almost no problem, and I mean extremely little problems on mineralized sand or salt water. This bad boy just glides over salt water. If these other people and I didn't really believe this and weren't speaking from true experience, I don't think youd hear this many acolades about the Quatro. I know we're pretty fanatical about it, but for me, at least, it's the truth. I've never even used anything close to what this detector can do, IF IT'S WORKING PROPERLY, AND YOU'VE SET THE ADJUSTMENST CORECTLY, which of course just comes through knowledge of the instrument, reading Andy's book, and the owner's manual. Marc Trainor.