I've been to Boston several times now, and I still use this map to help me find my way around the city. It's a detailed map that shows all the hotels, landmarks, and points of interest.
It shows you where all of the T-stops are, but it does not show the MBTA train lines on the large map. For example, if you wanted to know the route of the red line, you have to fold the map over and find the small MBTA route map on the other side.
The one thing I really like about this map is that it is durable. I have had so many other maps that get torn and wrecked. However, this Fleximap is laminated and can be shoved in your pocket or bag over and over and still hold up.
The only other issue I had with this map is that it is strictly a Boston map - there is a tiny portion of Cambridge on there, but it doesn't really help if you plan to visit Harvard or anything else in Cambridge.
Overall, it's a good map that will last. Still, I have seen other maps of Boston that include the MBTA route maps, and that helps if you are going to be taking public transportation!