It's a great place to base out of. An hour's sail to Vinalhaven, three or four hours to the lovely Merchant's Row or Isle au Haut. Decent transportation hub (train from Portland, buses to Boston, etc) and free parking. Fairly reasonable mooring rentals (~ $100-150 per week). After renting a mooring the past few years for 2-4 weeks each summer we ended up buying one from the local harbor Nazi. It's roughly $95 annual fee to Rockland and $200 for annual mooring inspection and maintenance to the aforementioned Nazi. Once you get to know him he's a nice enough person