I'll add some more. Another advantage for me with the Cav is the fact that the polymer receiver does not transmit heat or cold like the aluminum ones do. I live in northern MN and I use my rifle out in the snow and ice when it is well below freezing and sub-zero. Any metal like the barrel and magazines pick up ice every time they get snow on them, but the lower doesn't. I also notice less condenstaion when the rifle goes from cold to warm and back again.
Ergonomicly everyone is different. The A2 grip and angle is not as comfortable for me as the Cav. I also shoot a Benelli Nova shotgun which has a larger grip than many other shotguns, so i think that I just have a prefrence. The stock length works fine for me as I don't use it for CQB roles or wear body armor, works fine with heavy clothes for me and I am 5' 10".
Warranty cannot be beat either, Something that is their fault is a free new receiver. You bust it, run it over with the truck, etc. $30 new receiver.