this is some freaky, yet neat technology. It could be really useful for people with damage to their semicircular canals (the part of your inner ear that acts as a level sensor) or the attendant nerves. People with impaired vestibular sense have a terrible time adjusting to either a lack of sensation, or a constant sensation of vertigo. so this could really be a big help.
It could also have applications in simulators–it may be easier to stimulate a pilot or driver’s brain to make them feel off balance rather than build a motion platform or have them ride the vomit comet. Although it could be a pretty freaky experience, if it is proven to be safe and effective, it could have good applications.