Creepy acting, but the product actually looks OK. You move the mouse by wiggling one foot around and you left/right click with the heel/toe of the other foot. It's expensive because cripples are a niche market; you could easily spend way more than this on a mouse you control with your head or your tongue.
Look at that radiant smile!! Now, look at which operating system she's using. WINDOWS XP WITH SMILES? NO SIR THIS IS A LIE! Also why is the firefox icon all the way over there? They couldn't take the time to delete the iTunes installer file before they shot the ad? These people need to get their shit together!
Just plug and play! And do a thorough ergonomic evaluation and completely modify the way in which you sit at the computer, overcoming years if not decades of muscle memory and ingrained bad habits! It's that simple!