I have heard that about the Vodka taste testing before...
If you drink enough Vodka straight, you can tell a difference. Most people can't stomach the taste of straight Vodka even though everybody loves a good vodka redbull (I don't
)
Go line up 5 Vodkas in a row
Popov, Smirnoff, Absolut, Stoli and Belvedere or Goose
Most people won't tell the difference between any of them even thoug they're listed according to price.
Then over the next 5 nights (or one night a week) drink as much as you usually would of each Vodka (for me it's half a bottle or more in a night)
Tell me how bad your hangover is the next day.
I have never had a hangover with Stolichnaya but I've puked my guts out for two days from Smirnoff/Popov type stuff.