Funnily enough my two favourite vodkas are black cow and chase, both outstanding imo, chase overall, black cow for particularly good smoothness.
You should try the fish and chips distilled one too.
Nice enough vodka - just a shame their marketing idiots don't know what the English flag looks like! Or maybe they don't actually have any national pride, but are merely cynically exploiting words/symbols they think will help sell their product.
Chase make some fantastic drinks (y)
Look up Black Cow Vodka.