I use the AT Pro, have had my detector for a little more than a year. Just had a great Friday/Saturday hunting some homes and curb strips up in Central Montana, ended up with 17 silver coins and one Sterling ring on those 2 days, along with about 150 other coins including tokens, Buffalo and V nickel, Indian Head, 50+ wheaties, etc etc. I really like the tone quality of my machine, have watched a lot of Hoover Boys vids on YouTube, and don't care for the sound of the AT Max nearly as much.
From reading about the Nox, I realize it may be a better machine than my Garrett, but for hunting here the Pro does a great job. The coins are not super deep, and most yards are pretty clean of iron. I do notice when I get up close to these old houses, the Pro starts to chatter like a machine gun as it goes over the small bits of iron or nails. To cope for that, I slow down my swing, and listen for any small squeak of high tone, then work to isolate that sound and zero in on the good target. Sometimes I can only move my coil 2 inches back and forth to locate the target in the iron. I have found many good silver coins in this scenario, though other detectors may be even better. And yes, I accept that the more expensive units like the CTX 3030 and Deus, along with the NOX models, may separate better, and will go deeper than my machine. I get about 8 inches max on a silver dime, 9" on a copper cent, and 10 inches on a silver quarter, and that is with pressing the coil into the grass and getting that sweet faint and repeatable high tone. I am still learning my machine, and I have dug many good coins, especially this year, that also had a rusty nail in the same hole (found with the pinpointer), so I know the AT Pro can do a decent job of letting me know that something good is still down there. I run Pro Zero, nothing notched or discriminated out, and sensitivity at max.
Heres another video that will help the fellows up above who say the pro is great in iron. The moral of the story is the AT series is subpar in todays market.
BTW how did a mx 7 get brought up never even said a word about one that I can remember off the top of my head. I guess that's one I need to try...
BTW the main problem is it has no iron volume and the iron tone overrides everything else if you have iron audio on or the disc ran down low. Garrett could have put a iron volume on it and it would have helped a lot. 
