Overall:

It MOSTLY smooths pantylines. It definitely squeezes stuff, not sure that I would say in place. It is noticeable at the edges above and below.

I bought this for a couple dresses I have and a pencil skirt I'm in love with but doesn't look very good when I wear underwear with it and even without underwear, my hips look square more than smooth, but I digress.

The packaging is not impressive, so don't expect anything special. The slip may not look like it's going to fit when you see it at first but it will, it looks like that because it's about to "squeeze you into place."

It's not too bad to deal with when you have to go to the restroom but it does not stay in place when moving from one place to the next or from seated position to standing, etc.

I'd say I'm not entirely disappointed with the purchase, but it didn't meet my expectations for a control slip.

To put this into perspective, I'm 5'1"; 112 lbs.; and wear a small to XS. The purchase was really just for smoothing which it does OK.