Welcome mps! Glad you're here.
You asked "what are the positive changes people experienced."
Well, i have a two part answer:
1st, my positive changes were i slept better, i could remember some dreams,
the bags under my eyes started to lessen.
I feel more social with people, not as quick to get irritated.
But most important, 2nd: I don't focus on the changes, whether they are positive or negative. I say that, because you will experience changes both positive and negative. And, you will experience problems with your sobriety. Simply because all of us have problems in life.
So, i focus SOLELY on not drinking each day.
I've decided that is my ultimate good.
Thanks for asking!