When wine is poured in the vinturi, its design creates an increase in the wine's velocity and a decrease in its pressure. this pressure difference draws in air, which is mixed with wine for perfect aeration.
but what really matters is vinturi's affect on wine.

Better bouquet
sample the nose. you'll appreciate the subtle aromatic differences and the full aroma of the wine. vinturi allows wine to display its intended aromas.
enhanced flavors
go ahead, take a sip. vinturi's wine tastes better. it is more flavorful and has better mouthfeel. it tastes like a richer, more expensive wine. it tastes like it was intended to and is more enjoyable.

Smoother finish
ahh. vinturi's aeration is very effective at softening tannins which results in a much more pleasant finish. any bitterness or bad aftertaste is reduced or eliminated.