mickfin, I just had to jump in here on this, again. I'd say the Quatro, definitly competes with the Explorer in many ways, but the main difference I see with the Explorer is that it has two numeric readouts, one for conductivity and one for ferous. That gives you more information on whether to "dig the target or not". There are some other "goodies" that the explorer has but as far as depth, I think they are pretty close, from what I've read. I own the Quatro, and I'd say it's easier to use than the Explorer, has notch discrimination, goes very deep, and does a great job.I wouldn't let the Explorer scare you, because with any detector, your gonna have some kind of "learning curve", but as far as less of a curve, I think the Quatro has it there. You're not gonna be sorry with the Quatro, the only thing you might wonder about is: How much better or, "do I really need" this double numeric readout? I don't know, but like I've always thought, the difference between and Explorer and a Quatro is the difference between a fully loaded Honda Acord and an Acura. They're both made by the same company, but the Acura is more expensive and probably has some more bells and whistles.