Yes, I used GaitAid a few times. It is a remarkable device and seemed to really help me. The problem at the time was the cost. My insurance wouldn't cover it and I just couldn't afford it.

The GaitAid, a portable home-use device, provides an alternative means to sensing and balancing the walking body. It includes glasses and headphones which display an image super-imposed on the real environment and plays a sound for every step.

The idea is to give the brain additional sensory input through sight and sound which establishes a clear sense of timing for walking, a target for each step, and feedback that the body has moved.

http://www.gaitaidmedical.net/howworks.html