From the legal aspects alone, the world in MA has turned on its head since 1998!
BUT you have to watch out for BAD legal advice that may be given out as part of the course. I've heard plenty of it out of the mouths of NRA/MSP Instructors, LEOs, chiefs, as well as their students after they have taken a course.
My New Member Orientation Course at a gun club was given to 40 new members (including myself) in January 1999. The instructor was an NRA/MSP Instructor and retired PT PO who proceeded to tell all of us that if we used any targets SHAPED like a human we could be arrested on the spot without a warrant as a violation of the 1998 law. Knowing better and deciding not to challenge him publicly (I had no documentation to back me up in hand either), I went home and sent an Email to the club president (an attorney) with my backup citations. The club president made a point to correct the errant instructor and make it as a public announcement at the general membership meeting the following day. Problem was that I was the ONLY new member present and 39 others from that class probably still believe what they were told.