Yes when I installed the tune I noticed many differences; Oil stays clean or didn’t get dark to about 7,500 miles, bump in power bump in mileage, dramatically better cruise control especially towing, the turbo brake rocks, stopped getting orange lights on my dash for stupid lil trivial stuff.
I have not gotten the AEM. Yes I have ECM & trans tunes. Worth it to me. I use the better 10k rated Ecoguard oil filter but only the Mopar fuel & water separator filter. Critically important if you ever got contaminated and damaging fuel for warranty purposes. Amsoil is good stuff. T6 is just reasonably priced & readily available for a full synthetic and Ram approved. I used the Pensoil Euro L for the first 170,000 miles no issues then switched to T6 and have run it since.