I would never buy a grinder with a doser, although I know some can be removed. I can get my Mini Electronic virtually clear of all stale ground coffee between the burrs and the chute in about 10 seconds.
The bigger burrs on the Mini Electronic (same as the Super Jolly) and the anti static chamber (cone) is what sold me.
Here are some negatives:
The push buttons for auto timing doses sounds good but blows in reality as it doesnt account for changes in bean density or relative humidity which can affect how much ground coffee is produced in a given time period. I have tweaked the timer to be a little short of all the beans I grind and use the pulse button to top up.
Another issue is that my Giotto portafilter dual spouts are too long for the Mini and hit the base of the grinder so I cant get it right under the cone. I ended up removing the spouts altogether so I have just a gaping hole in the bottom - works well!
Finally the shelf that the portafilter sits on is a little too low and I do get some coffee thrown outside of the basket, more so when the beans are a bit drier.
I notice that Mazzer now sell a Model B of this grinder which has a micro switch at the back of the shelf. Dont see any value in that.