Wow, that's good information to have, Ivan, about purchasing off of tv commercials. I generally wait until I find the item in an As Seen On TV store, if I buy the thing at all. Eventually, someone else makes a similar, and generally better, product that you can buy retail.
Also, stuff in teevee infomercials tend to be so gimicky that they seem reasonable in the middle of the night and not-so-much in the light of day. Although you did like the cat scratching thing, yes?