I always found this system very interesting, since the citizen can decide how some of their tax money is spent (besides voting). On the other hand I have always lived in Northern Italy, and around half of my taxes go to the poorer regions of Italy, mostly to be squandered by corruption, clientelism, and organized crime.
Everybody says that, Catalonia that it pays more to Spain that it receives back, California and New York to the rest of US...
But it's the only way to have nation states, otherwise we'd have to go back to city states (which some people like Taleb actually advice).