Sprint has improved dramatically all over NYC.
I live in Flushing and get 6 Mbps on B25 at my house during peak hours.
A few blocks away on Northern Blvd and 150th Street, I get speeds of 50 Mbps on B41.
I am typing this from a cafe in Bayside, connecting off the Sprint network at 25 Mbps B25.
Before February, this location was 3G only and crawling at about 30 Kbps.
The Bronx, Brooklyn, and Manhattan have similar success stories.
Consider donating to S4GRU to obtain detailed information.
PS To see the benefits of the network, you need a tri-band phone that can access B25, B26, and B41.