Hey Bill,
I will do my best to explain....
Firstly the pads size of these is almost double, which obviously increases surface area of the pads in relation to what clamps the disc...ie. more friction area. ( see attached pic, not really the best pic)
Basically the more pistons the better the distribution of pressure across the pad, Increased fade resistance and more progressive pedal feel and more pedal control.
These are still only " floating " type caliper as opposed to your " monoblock " type which are generally 4 or more piston (pistons on each side of the caliperfor both pads..which increases all the above points again even more so)
Monoblock 4 piston
Hope this helped :D