I think they get a bad rap because:
A: They're not much to look at.
B: They're pretty slow compared to many other designs.
C: They were originally marketed as a sail boat that you can water ski behind with a 50 HP motor.
I wouldn't own one because it doesnt suite my needs which is strictly racing. If I had a small family and needed to trailer a boat, I wouldn't hesitate. I know several people who own them and love the ability to Trailer to different areas.
On a separate note Their is a 50-60' Mac in our harbor I'm trying to find out the model. Any thoughts?