Product review (4 stars): Chintzy, but does the job.
As many others have noted, this product does what it says and moves the air from registers behind out to the front. But it is surely is over-priced - this isn't worth any more than $5 to $8. Very flimsy plastic. The provided clip did not hold the extender in place on the register - I had to tape it in place. I also taped the two sections together when fully extended.