I bought this product for two reasons:
1. I have two kids and back issues and I wanted a way to target my leftover pregnancy pooch since I can't really exercise it away.  After a week I can actually tell a little difference.  I still definitely have the pooch but it's already noticeably less saggy.  I didn't expect it to work that fast so I'm interested to see more long term results on myself.
2. Like I said, I have back issues including herniated discs and a pinched nerve and nothing brings me relief.  The closest I could get was wearing my steel boned corset but it was a full one that pushed my breasts up to my chin, which just isn't practical to wear all the time.  So ultimately I was looking for something that would help my posture but not limit my breathing.  I was a little disappointed that the steel boning in this is super flexible so I'm still able to bend at my back.  However, if I put this product on the second or third row it's tight enough to do what I need.
Overall, I do love this product as I got it mostly for "medical" purposes with the shaping/weight loss as a secondary priority.  I wear this for about 10-12 hours a day and I'm still comfortable in it.  I gave it only 4 stars because I wish it would have been slightly longer, but think I just have a long torso.