Overall a good experience, both ways. Service is apparently about every half hour, but not on the :00 and :30. I had to wait maybe 15 or 20 minutes at arrivals, and the ride was maybe 30-ish minutes due to the convoluted route because, well, Boston. Return I waited maybe 10 minutes out in the freezing wind and was at my terminal in under 20 minutes. $3 for a convenient RT to and from the Sheraton? Wow.