The Boston Police are not actually getting their own helicopter, as this article in the Boston Globe explains, but they will be flying in one. The State Police are supplying the helo, the fuel, and the pilot. This is a great deal for the city. There is a crime problem here, the helicopter can help, and the cost is borne by the whole state.
Boston police are already girding for criticism about noise and intrusion from city residents who are now accustomed to having copters whirring overhead only in the case of a manhunt or disaster.
Who would criticize? It's not as if they'll be setting it to hover over one house at a time. It's a great idea. My only concern was that the Troopers and the Boston cops inside the cockpit might kill each other, because the inter-agency rivalry has been known to boil over on occasion. But it seems everyone is playing nice, and that's to the benefit of the city.