It won't replace the Excal or the GT. Those are simple machines (that still have raw power to go as deep or deeper than anything on the market) for people who want to just hunt and not be bothered by doing a bunch of things on a computer screen. Besides that, the price of an Xcal looks like it will still be about half the price of that thing. GPS and a computer screen is pointless when your waist deep in water and the screen is under the water, but if they could have made it cheap and light enough to also use on land then that would be a big perk light the AT Pro.
I was hoping for a waterpoof but cheap AT Pro killer price wise, with a simple LCD screen and being LIGHT so it could be used just as easily on land as in the water like the At Pro. Minelab could have even used the older and cheaper (but still as deep or deeper than anything on the market) BBS technology to keep the price down and then eliminated the Xcal and GT from their line up as a new light water/land machine would have replaced them both and sucked away some of the AT Pro sales. I know the AT Pro isn't as deep as a Minelab, but at that price it doesn't have to be for many people who want a light land and water detector with a full LCD screen so it's just as comfortable on land as in the water. I'm a bit let down by it all. Too much money, too much weight, and too many questionable features in terms of actual usefulness.