Script for quick selection of all visible instances of all selected objects.

Select Instances in max works only with one selected object.

Select similar allocates not instances, and "similar" objects, that is can allocate superfluous.

The script works much faster than the analog of Soulburn.

Video demonstration and comparison with the built-in functions of 3dsMax: https://youtu.be/f3LN1b0dh9Q