I use the MIAD with the large backstrap and flat front strap. It is much bigger than most AR grips and fits my hand better.
For some reason, the way I grip ARs, my fingers don't line up with the finger grooves on AR finger groove grips like the Hogue. On the regular A2 grip, the spike on the front stabs me right in the middle of my middle finger; I find that particular grip to be very uncomfortable. The grip is the first thing that I immediately change out on any AR lower I acquire.