I love backless dresses. I'm also large enough where not wearing a bra doesn't look all that great. This was the perfect solution.
Functionality: It does what it can considering there's no straps to really pull things up. What this bra offers is the ability to pull boobs together so if you can imagine your bra-less chest, and cup them with your hands and move towards the center. that's the look you get. it does not provide lift. however, if your chest is on the larger side, and not too droopy side = this is more than adequate to provide a good overall shape.
I don't like big chested look, so i've always avoided the "push-up" effect, so this was good for me. I even liked wearing it with form fitting tank tops. No more back fat from tight bras!
I do not exactly place each flap where they indicate with their instruction manual. I tilt it slightly so it actually pulls them more together. The stickiness is sufficient for all day use. But it does take a few tries to match both sides equally.
One LESS star is because it takes FOREVER to dry so I cannot wear it back to back. Since you can't exactly wring it out, it needs to sit---sopping wet until dried.