Just to be clear and fair, just because you used one is not the same as owning one and learn it as it should.
There are detectorists like myself who use this machine at the beach where the ATP doesn't actually shine in wet sand, the disc pattern I can do with the 3030 has no comparisson in a primitive disc which is basicaly conductive =/= non conductive of the ATP, I can dig bi-metal coins (Stainless Steel ringed, center is a bronze alloy) and still can discriminate 95%+ of the rest of the ferrous or trash targets for me, try that with the ATP and if it can detect one in wetsand, it'd be nulled cause of the SS ring.
Target separation is so good that this bi-metal coins show as 2 targets in the screen in Ferrous/Coin mode.
If I wanted a true deep machine, I'd get a PI, but I dont envy at all the couple extra inches they get vs digging EVERYTHING, I can live by getting the 17" coil and gain a couple of inches in depth, pricey yes but since I won't be digging trash It'd be paying for itself in no time even with clad.
Raw depth does not equal as a better detector.