"We used to call it the old barn, but we can't call it that anymore because it looks pretty cool," said one concertgoer.
They spent $165 million dollars to fix up the 'old barn' after the Islanders left, and it's still a sore point for some fans.
"I won't go there anymore, I was a season ticket holder for over 15 years - it is impossible for a Long Islander to have a good time going into Brooklyn. They belong on Long Island," said a fan.
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There were some complaints about the new Coliseum - the fact that fans had to pay $40 for parking. But for the most part, many say it is great for the economy, and good to have it in the neighborhood.
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It's in Billy Joel's neighborhood, too.