After using 4-5 different PI units on the salt water beaches in NJ, the Infinium was the best in terms of gold production.
It's nice to have a 'better behaved' PI, but I found those were not as sensitive nor as deep as the Infinium when tuned properly. Hopefully the ATX still has all the Infinium like gold finding capabilities, with better stability.
Granted the Infimium is a pain to tune sometimes in the salt water conditions, and in certain situations I have to run at less than optimal settings which may then drop the performance below the 'better behaved' units, but when the Infinium is tuned at optimal, it's a beast on the beach.
I only use the 10x14 mono.
So I guess I am saying for me, I would rather fight with the Infinium and try to get it set correct, knowing I have the ability to tune it, than use a less than tunable PI. The frequency check and GB features on it are something I cannot live without on a PI any longer.
Although the ATX looks tempting, I am gonna stick to my Infinium.