I usually stay in the Boston Harbor, but thought I would try the MO.
The location is very central, though not perhaps as useful as the 4 Seasons or as 'scenic' as the Harbor. Its well appointed and the room was large, quiet (despite location) and the service was excellent. The restaurant was up to usual MO standards. I didn't use the spa but seemed an excellent set up. All in all an excellent hotel.
The only quibbles I have are that I think I prefer the BHH for location. And no MO ever seems to be as good as the HK parent.