I bought this bra, and returned it, when it came in the grey color in a 32H. It didn't work for me and I was so confused and disappointed, but I've recently remeasured myself and I'm a 30H which makes a difference! In the correct size this bra is AMAZING.
I LOVE the style. I don't feel weird about my bra back showing because it's lacy which is on trend and makes me feel fun and young (I'm 21 so I should feel that way about my bras!). I don't fall out of this bra. There's some mild adjusting to be done if I move around too much (like bending over a BUNCH or twisting a lot, but I just have fuller breasts and they tend to shift). I've found that my back does hurt a bit when I wear it, but I think that's just because it holds the weight differently than my Panache Jasmine Balconettes.
My only complaints are that the pink is too dark for lighter tops and that softer material shirts, including t-shirts, really stick to the cups and highlight the cut-and-sew details. I would love this in a nude/lighter color that isn't so obvious. I will be purchasing this bra in the Black and Burgundy however because I love to wear tanks and I live in the south so it's swelteringly hot 90% of the time.