I am just looking at this thread for the first time. I try not to be negative in posts and please take my coments with this disclaimer in mind: I have never sailed on a McGregor. But I have seen them in action and have read a lot about them on this and other forums.
My impression is that the general consensus among sailors is that they are powerboats with a mast, not sailboats. If you are truly interested in sailing, steer clear. From what I have heard, they are not at all good boats to learn to sail on. If you are interested in a powerboat with an (extremely limited) sailing option, maybe it is for you. I apologize in advance to those who love them.