This bra varies in size by the color. I have the rose/gray one and the purple one.
The rose/gray bra fits well in the band (though it does tend to feel uncomfortable as the day progresses, but I'm used to wearing a band larger than I need), the purple is uncomfortably tight in the band as soon as I put it on. I'll probably get an extender which will fix that problem until the band stretches a bit.
On both, the cup width is perfect. The problem that I'm running into, is the same one I have with all bras larger than a C cup: the underwire is tall and pokes me in the armpit.
I loved the look of this bra, and the fact that it's a convertible just added to the appeal. However, the cups are a bit too large and the band on the smaller side. By measurements alone I should be a 34E/DDD, so the band difference was actually a plus. The straps are still too far apart for my sloping shoulders, and if I convert it to a racerback, the top of the cups are very empty, causing the cup to wrinkle and the straps to cut into my armpit. Maybe after wearing a properly-fitted bra for a few months will allow my breast tissue to migrate back into place and this bra will fit better!
