I have something similar, not sure the brand and though they haven't made a difference in the shape of my bunions, they do make my feet and toes feel good and stretched out (for lack of a better way to explain it.) I use them more in the summer (since I think of it more when I'm barefoot) just for an hour or so at a time while I read or watch TV.
I know that Dr. Scholl's makes something similar and I believe less expensive (Walgreen's, Target, etc.) May be worth looking into.
Good Luck!