I have the Walk-Aide. It is a simple cuff that holds the walkaide device. It goes on your leg just below your knee. It's programmed specifically for you. Initially proper placement was an issue for me but I caught on quickly. With the new replacement cuff that I'll be getting next week (they wear out with regular usage) that won't be a concern at all.
I never looked into the Bioness because the extra pieces turned me off. You can wear the walkaide with any shoe or sandal. It's very easy and it helps those of us with vanity issues. Unless you're wearing shorts or a short dress, it isn't noticeable.