welcome to CoffeeSnobs.
Im not too sure your list of machines really covers the espresso machines that members of CoffeeSnobs use. A quick read through the hardware sections of this site will give you a better idea of the wide variety of machines that CSrs have in their kitchens.
I am curious why you selected those 7 machines (with two Sunbeams which will surely skew the stats):
Krups XP 4050
Saeco Via Venezia