I have seen the Venturi one at Costco recently.. I just thought of them as more of a gimmick. I have been decanting wines for many years, and always have seen the benefit of the wait time (sometimes hours). But after reading the Amazon reviews and looking at other sources, I may give it a try. I hardly do anything to my white wines (other than the aggressive glass swirl, and down it goes). It is not that much of an investment to give it a try (and Costco's return policy is really easy). I have tried the little bottle top kind, and it did not seem to make much difference to my palate.
Cheers,
Mikey