I can't believe all the negative reviews for this bra. I just LOVE IT. Might even buy another one as a backup. I vacillate between size 28GG and 30G. At first I tried 28, but had to exchange for the 30 band. So if you're between sizes like me, go with the bigger band.
The wide band and soft cups are super comfy. The band does flip up a LITTLE at the base of the cup, but stays in place everywhere else. Perhaps it's something to do with the tension where the fabric curves along the underwire.
The plunge is deep enough that it doesn't show in low-cut tops, the straps are not overly wide-set, the wires aren't too wide, and the cups are flexible enough to accommodate my very narrow and projected breasts. Really happy with this one!