Vamoose gets me there and back every time.
It's always a hassle getting from Brooklyn to downtown with and extra bago or two. Waiting in line for the bus on the sidewalk in Manhattan leaves one exposed to the extremes of NYC weather. Once I'm on the bus, everything is OK. Sometimes there's a rest-stop, always appreciated by me, the extra 15 minutes makes no difference in a schedule beset by variables such as traffic and weather anyway. More often the trip is non-stop, but either way it gets me down to the DC area to see my family, and back up to NY every time. I have no complaints, and only good things to say about the staff and drivers.