As others have mentioned, the AQ will take some time to learn in order to get the most out of it. In my one hunt with it so far, I see that it's a more effective PI machine than others I have used (Impulse, Sea Hunter, Dual Field, Mirage, Vallon VMH3CS). It has a stable threshold (lots of EMI where I hunt), an effective tone mode and is waterproof.
For my first outing I chose a beach that I know well, that also happens to have tons of iron, pull tabs and jewelry. I used the factory recommendations for submerged use (11.5 delay, default everything else) and all metal mode for a few hours. Switched to tone mode in the heavy iron areas and back to all metal when I heard a high tone. The amount of feedback I get from the AQ allowed me to skip over certain types of iron targets that are scattered throughout this beach - other machines were not as easy to do this with. On the second battery during this hunt I just stuck to tone mode and dug high tones only - resulting in one nice 18k pendant. Sure, any other good waterproof machine would have found this pendant, but I don't feel like I'm being bogged down by iron and lack of discrimination for once. Also, I noticed I'm not digging any more microscopic pieces of aluminum like I did with the EQ, CZ21, CTX or Excalibur.