As you see, the content is masked equally on the left and on the right sides, but backgrounds are drawn differently. The left image is Sliced, the right one is Tiled.

Sprite's borders are drawn a bit stretched.

An Image is displayed incorrectly in the Tiled mode when in uses Sprite with Tight mesh type.

I want to inform you about them because you can encounter them while using Soft Mask too.

Working on update 1.1, I've found some bugs in Unity. UPDATE Soft Mask 1.1 is already available on Asset Store. Fixed a bug preventing rendering of the child elements when a mask used a sprite with one of its borders set to zero in Sliced or Tiled mode.Fixed a bug preventing Soft Mask from updating after moving it from one canvas to another.The partial consequence of this was the inability to use Soft Mask in a standard Dropdown control which uses nested canvas for the drop down list. Fixed a bug causing Soft Mask to work incorrectly on nested canvases.

Reworked samples: they now demonstrate more features of Soft Mask and also look better.

Improved mapping of Sliced and Tiled masks in the case when the central part is collapsed.

Soft Mask now has almost the same performance cost on CPU as standard Unity Mask (which is very close to zero).

Optimized real-time performance, especially on huge hierarchies.

The sample 04-CustomShaders has been reworked to show this feature in use.

Added the Separate Mask parameter that allows to separate mask from the masked elements.

The updated package should become available soon. The updated documentation and demo are already available. I'm very pleased to say that version 1.1 has just been submitted to review! This update introduces separated mask mode, significant CPU performance improvement, and several bug fixes.

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