My experience with the MF 60" blower has been... well, impressive, to say the least.
I have had it bog down a bit, to the point that I had to move forward a bit more slowly, but only with wet, heavy snow. The throw distance was reduced from 50+ feet to 30 feet or so, still pretty darn good in my book.
As has been pointed out, however, be sure to dress for the weather- I do get pretty well covered with snow if the wind's not cooperating; most of the time I just wait for the wind to die down before attempting to blow.
Take a look at he pics and see how much snow is ON the tractor.... just imagine what the operator looked like!