I've started HRT, and I'm very happy about it.

Naturally, I didn't notice anything at first, but about a month in, I woke up one morning and I had breasts. Okay, they're tiny, hardly noticeable, but they are there, and I could hardly be more happy. I've long wondered how large they will grow, considering my age and the figures of the women in my family, and then
Zythyra posted a link to a Monica Robert's blog entry containing the following claim:
Quote from: Monica RobertsBasically a transwoman's breast development will be the average size of the biowomen in her family.
I've never seen such a clear statement as that; for example the Wiki here makes the rather weak claim, "MtF who undergo HRT often experience breast development which is below the comparable natal female norm." Well, that's no surprise -- the same is true for natal females!
So what are your experiences?