HRT is the spice of life for our lot. They give mental happiness as well as needed physical changes. I honestly would not enjoy life if I didn't have them.
Warning though, if you are trans and start on them, you are very likely not going to be able to go off of them without a monster amount of willpower.
As far as measurements go, my girls are 36 C-D. My heart leaps for joy every morning when I see myself in the mirror, well it does for that brief moment until I see "it". I can't wait until that's taken care of too.
long story short, HRT affects a lot and I can't imagine my life any more without it.