Geo, whoever told you that was probably thinking of a different type of back brace. The ones I'm referring to have more "give" than traditional, made-for-the-purpose binders, despite being made of a thicker elastic and softer material, and simply wrap once around the body, and are fastened with velcro at the overlap in front (with additional velcro sewn in if the end flap doesn't have enough to hold it fully in place). Most importantly, you can take the full, deep breaths that you aren't able to in many of the usual binders -- it's like wearing a T-shirt compared to the Tri-top (and the riding up and pinching that happens with the Double Front never happens), for instance. It still constricts (it IS a binder) and it does get hot and uncomfortable eventually, but it's not dangerous. And yes, whether or not it will work for you depends on your body structure (as I described).
ETA: Also, easy to take off. If you're having any kind of issue, you can just reach under your shirt, detach the velcro, and remove it in seconds.