I found the shape, lift and support of this bra to be excellent, with one of my maternity tops fitting better than it has in a long time.
Feeding was fantastic because I just undid the clip and could feed Hannah straight away; no muss, no fuss. The only thing I didn't like about that situation was that if you weren't wearing a decent maternity top with good coverage, your boob is out there for the whole world to see.
I found that wearing the size 14 was uncomfortable - because it's too big in the back for me I had it on the 4th hook but even then it kept riding up. Tomorrow I will need to wear the 12J and see how that goes.
The other issue is that when you're fitted for a maternity bra you might have just fed your baby, or your baby is due for a feed, and both situations will impact what size bust you have. I found that this resulted in an AMAZING cleavage at one point, with a little bit more breast tissue at the top than I should have, but once I fed Hannah it fit perfectly again.