I just the masks for pretty much everything I scan. However, it seems backwards to me because I have to select all of the areas that I do *not* want in my final model instead of just what I *do* want. It's much harder to exclude all of those extra areas in the photos than it is to just find one good reference photo and say "here's the area I want, forget about everything else".
So, it would be great if the Masks feature would allow for this.