Some of my own examples since the tool doesn't document what type of output to expect:
> OT_Advanced_Tuner.sit is a Stuffit 5.5 file. This file requires StuffIt Expander 5.5 or later, which needs a Mac running System 7.0 or later. These files are not compatible with 68000-based Macs (128K/512K/Plus/SE/Classic/PB100/Portable/XL)
> Disk-Copy-42.sit is a Stuffit 1.6-4.5 file. This file can be expanded on all Macs with UnStuffit 3 or StuffIt Expander 4.02 or later.
> CYO.sitx is a StuffitX file. This file is too new to be decompressed on most vintage Macs. All .sitx files require StuffIt Expander 7.0 or later and a Mac running Mac OS 8.6 - 9.x or Mac OS X 10.1.
> OT_Advanced_Tuner.sit is a Stuffit 5.5 file. This file requires StuffIt Expander 5.5 or later, which needs a Mac running System 7.0 or later. These files are not compatible with 68000-based Macs (128K/512K/Plus/SE/Classic/PB100/Portable/XL)
> Disk-Copy-42.sit is a Stuffit 1.6-4.5 file. This file can be expanded on all Macs with UnStuffit 3 or StuffIt Expander 4.02 or later.
> CYO.sitx is a StuffitX file. This file is too new to be decompressed on most vintage Macs. All .sitx files require StuffIt Expander 7.0 or later and a Mac running Mac OS 8.6 - 9.x or Mac OS X 10.1.