I used to love ACDs and breeds like them, and thought I would never have any other breed ... that is until I got immersed in the world of MAS, and purchased my first a few months ago.
At first I snubbed them as a "fad" breed, kind of like the "doodle" or "poo", but I have come to realize they are a thing, a thing that is here to stay ... and they are the breed I believe I was always meant to have. The differences btw the MAS and the ACD are.