This bra, like all Spanx products is simply glorified hosiery.  It is not made for support.  Yeah, if you decide to wear it, you may think you are braless.  Even so, it does not do jack for support and you can't adjust the straps.  After a few washings, the straps, which are just stockings will start to wear out.

Spanx has gotten a lot of celebrity endorsements which are a large part of its faddish appeal.  Celebrity or no celebrity endorsement, this bra is nothing but a heap of glorified hosiery.  You'll do much better with other brands.