This promises to be a much more audible leap relative to traditional no-feedback speaker systems, and you should be able to spot the difference for yourself after the break.
This feedback created the first virtual keyboard that I enjoyed using, and it makes a huge difference in the user's experience, and likely in the user's acceptance, of the new platform.
While confident that the setup wouldn't induce wild fits of feedback, Schwartz's invention would presumably cost a pretty penny, and would likely only make a difference to those professional karaoke singers out there anyway.