I'm on the upper east side and get LTE all up and down 3rd ave (less strong on lex). I walked down 3rd from 60th to14th last week and had 4g the whole way. Pick it up by Brooklyn bridge park. Even got it briefly in Clinton hill the other day, though it's weak. They have a lot of towers up but I dunno if it's "officially" launched yet.
"PRLs don't pick networks based on signal strength. On the 56xxx PRLs 800 and 1900 are both at the same priority. If you are already connected to 1900 then your phone is "happy" and will not scan for another network until it needs to do so. When it does scan it will look for 800 first. If it finds it then it will use it of course. I recommend you guys read up on the 2 PRL articles I wrote"