The last "body shaper" I bought was just like an extended pair of pantyhose. They legs were NOT free (these are) and when I was pulling it on, it tore and ruined the product.
These are quite the opposite! I was afraid at first that it was going to be the same kind of deal; it appears opaque at first, but when you put it on it stretches and looks just like pantyhose. I was happily wrong!

These are very opaque, and firm. My only complaint is that they are very tight at first; hard to get on, and off. I suppose that's to be expected since it squashes all of your undesireable curves down, though once you get it on it's actually quite comfortable. I'm happy that it is opaque and allows my legs to be free of fabric.