Stayed at the dock this time so I got to use the restrooms and showers which were functional - that is the best I can say. Also even in middle October they have a 50 foot minimum - not exactly boater friendly. But as always the staff were very cordial in implementing the town policies.
Update: Stayed on a mooring a couple times in Jul-19. As usual the staff were extremely accommodating and professional. This is a sure sign of excellent leadership there too. Still not a boater friendly town though. There is an entire bay (Katama) that would be (and was previously) awesome for day anchoring that is now off limits for no good reason. Hats off to the Harbormaster leadership and staff though.
Another update Aug-20:
Stayed on a mooring for multiple day trips this summer. Water is great for swimming. Edgartown harbormaster staff are the most professional around - they are efficient and courteous to the many boaters that come in looking for a day mooring. Despite a lot of crowding, I never heard of anyone getting turned away and they handle the dockwa reservations in real time amazingly well. Hat's off to the staff.