When i ordered the bellybra i wasn't really sure on how its going to work and fit on me.  Since i previously bought the maternity belt i was kinda scared it may be too tight around the belly.  Now its not the same as the maternity belt but its more comfortable to wear, specially around the house because personally the belt was little too much pressure on the abdominal area for me. When i would sit down the belt just felt too tight, no matter how much i would loosen it up i could still feel it.  For walks in the park or at the stores the belt gives nice support but the bellybra is more loosen up and it still gives a nice support.  I got large, cause i read the reviews and the product details where it said its better to have it little big bigger, so it doesnt cut into your skin and makes u feel uncomfortable.  I am 5`8" and i am currently weighting around 172 pounds and the belly fits nicely.  The only thing i don't like is that on the back its little short.  I don't mind if it shows beneath a blouse, but i really love on how compact it keeps my breasts and the light support on the back.  You will feel the difference of having it on and off specially on your back.
For me, its worth at least trying it on and check that way if it is what you need and what you expect.
Give it a try .... if its not the product you wanted, you can always send it back!