Isn't it annoying when you simply want to crop an image, and then add the simple border effect only to discover that the border effect doesn't follow the crop? In fact, it gets cropped by the crop effect. That's because Apple adds transforms (crop, scale, etc.) after the effects.
Better Border remedies this problem by incorporating crop controls right into the effect. It's simple. Nothing fancy but I saw the issue pop up enough times on forums that I just published a fix.