I had the Nox 800 for 3 years, just sold it because of my shoulder. I bought the Apex the beginning of the year, kept it for 2 months, it was a total POS, but then again $800 machine compared to a $400 machine. But don't take it from me lets use facts, both were sold on Ebay, the $800 machine sold for $780, the $400 machine sold for $250, 3 years old VS 2 months old, granted I bought the 800 with the veterans discount 15% off, and it was a bit less when it first came out, so I got back more than I paid.
The Apex was sent back to the factory within a month after purchase, they said they repaired it (bull). If you watch any advertising on it, it is supposed to separated coins from iron, not the one I had. I was detecting and abandoned resort and was not getting many targets (just as it was in parks) then I spotted a copper penny next to some iron, the Apex did not see the penny. I took the garrett back to my truck and got the Deus, life was good. Yes I tried every setting, coins, us coins, jewelry, the Apex did not see or separate the coins, if there was more than 1 coin together, it would only see 1, the deus and nox saw all of the coins, regardless of how fast you moved.
So if you want to leave most of your targets in the ground, buy the Apex.