This can be an advantage or a disadvantage. MAS props do flex more than APC which means maybe they don't break as easy from ground strikes. The fact that the MAS props flex a little allows the pitch to drop slightly under a load. So lets say you are using a MAS 11x6 in a hard climb at full throttle, the prop will flex some and actually give you performance closer to that of an 11x5. Then when you level back out, the prop will flex back to higher pitch.
If that's what you want, that's great. Personally I prefer APC props on most of my planes because they don't flex and pitch remains more constant. Exceptions to that are the two Avistar's that I use for training folks, and my Somethin Extra, which I do some limited 3D with.