Blitz Induction cover

Anyone know any thing about these? Do they make any difference compared to just a replacement panel filter on its own. One of these covers with a Blitz pane filter should help with the airflow?

http://www.nengun.com/blitz/induction-cover

Seems abit of a gimick to me. Just drop a Green or STi panel filter in and job done. Why spend money on that thing?