The only reason I kept this bra is because the tags snapped off while I was trying it on.
I only use it for yoga and stretching -- activities that don't involve bouncing. In a 40DD, it does nothing to stop bounce. Since it gives you uniboob (I just expect this in a sports bra), they do bounce together. Maybe that's something.
It is very soft and pretty comfortable. I like the "flamingo" color. As other reviewers have stated, the band does roll up, which is not great.
I tried four different Moving Comfort bras. I also ended up keeping the Maia bra, which I like much better than the Fiona. Still, none of them offer the support I want. For high-impact activities, Enell is the only one I've found that keeps the girls in place. It's ugly, but it works.