I havenāt touched the Naida Lumityās 90 UPās since I got them, in November last year, simply because they work very well, my first fit was my last fit, no further tweaks were necessary, by me or my A.uD, the only thing that has been altered is a firmware update, last weekā¦ In my instance, the aids were set up before I entered my A.uDās office, apart from feedback management, after this, she asked me, how that sounds, I asked her to switch on compression, and swap to NAL NL2 fitting formulaā¦ Bingo, we were good to go! And that was itā¦ No further programming whatsoever, as they sounded spot on to me! There is no AI in these Naida Lumity UPās, a good A.uD can make them or most other digital hearing aids, sound almost linear, if he/she has the skill set, perhaps therein lies the problem, the good ones are as rare as hens teeth, if you find one, you would be advised, to cling on to them, like a limpet mine In my experience, there are only 2 types of Audiologists, āthem that know, and them that think they knowā, the latter will give you copious amounts of B/S, and fob you off, at every given opportunity, they are basically winging it, and they will try to relieve you of as much of your hard earned cash in the processā¦ Knowledge & Education is your friend, there are many absolutely brilliant A.uDās out there, there are unfortunately a few shysterās as well, educate yourself to spot themā¦ For these reasons, many of us DIY, I have Target 10.0, & Noahlink Wireless, but I am also most fortunate too have an absolutely brilliant A.uD, whom wants me to have the best hearing possible, and she will do her utmost to make it soā¦Cheers Kev