I've worn leotards under my clothes instead of a cami for a few years because I never have to worry about it becoming untucked or accidentally giving someone a peek at something.  However, the leotards usually have a thick seam around the leg openings which means panti-lines.  Also, taking a trip to the restroom can sometimes be a hassle.  This is wonderful because I have good coverage on top and no panti-lines plus control in the middle and I never have to worry about it coming untucked.  Overall it's very comfortable and with snaps at the crotch, a trip to the restroom is much easier.  It can be rather warm in hot temperatures though.  It would be great if Flexees made this in a cotton version.