I agree, AN is one of the only lines I have run and not run into random deficiencies. Which is funny, because most of the haters say its incomplete. Most of the time, I don't even run all of the additives. The other thing is cost… The nutrients are so concentrated that I have never run past 3/4 strength in flower. As it is the application rate beats out most lines and products, but when you don't even run at full strength, cost aint shit.
AN is mixed from RO water and the base has enough calmg, so you don't need to supplement even if you are using an RO. They recommend you run RO and don't recommend calmg. I don't run RO, but I do like to run it with an inert medium. I ran it with OF for a long time, but switched to Sunshine 4, Pro Mix and now I am using Happy Frog. Way more constancy. I am liking HF with extra perlite.