I haven't had any success with corsets. As far as I am concerned, all three of the corsets I have purchased have been or should be assigned to the dust bin. Some, well maybe more than some, of the problem is not spending the funds necessary to buy a good one. Secondly, lacing them for maximum affect isn't a solitary enterprise despite videos to the contrary. Maybe I'm just inept.
Personally I think diet and exercise are the way to go.