The Nox's pinpoint function is less than great. It does work, but a bunch of bugs, and does not work nearly as well as pinpointing on, say, the Etrac. Problems I experience include "sticking" (tone stays on, usually at loud level, even when move coil off ground); volume problems; and too much not fading along one axis (probably because something else is nearby, but Etrac much better on this one). No deal breakers, but irritating. Hopefully Minelab will fix some of these in a firmware update.
What?! My EQX pinpoints more accurately than my E-Trac or CTX ever did. It sounds like your problems are more about HOW you pinpoint than the actual pinpoint function. Yes, I have had very low pinpoint repsonses and have had it "stick" a few times, but the same thing happens on the CTX and on the E-trac. It because of what is under the coil when you push that button, not a failure of the machine.
Well, then, "how" I pinpoint works fine with the Etrac and the other 5 detectors I have, but not with the Nox, I guess...