I bought the waist nipping brief in the nude color and it truly gives firm control as advertised. For reference I am 5 3", wear a womens size 8-10, and weight approx 160 lb. I ordered a medium and it fit nice and snug. This feels like a true girdle around the waist! I especially like that you can pull it up to cover up the back fat, which was my main reason for buying. You can also unhook the panty area to easily use the restroom. The legs on this brief are really comfortable and do not squeeze or cause an obvious thigh/crotch bulge lol.
My only issue with this brief is that there are hooks in the front of it that can be used to take on/off. The hooks remain exposed and they show through clothing! Why why why would you not add a flap or something over it to make them "invisible" hooks? You cannot simply wear it backwards because number 1, it is very tight and 2, the panty part of this wouldn't fit correctly.
I do like this item but am slightly disappointed that I always have to wear a tank top over this so that the hooks do not show through the clothes. But IMO it definitely does offer tight tummy control.