I've used the original version of that one, by Sassybax.
I'm a 36D, and I feel like the Genie - and other "sportsbra" concept bras - just totally flatten me out.
The idea is that it gets rid of back rolls that a regular bra produces.
I've swtiched over to the Incredible bra from Victoria's Secret. It seems that after years of totally ignoring average women with big boobs, they finally figured it out!
I LOVE THAT BRA. Same concept, smooth band around the rib cage, so no back rolls, and it works wonders for giving the girls a lift. It "auto adjusts".
Highly recommend it. And I'm a bra snob!