Helps one tremendously when there's a new update/patch and you want to just see what's new in the files. Let it be UI elements/Audio/Textures etc. Also shows the modified files as well.

FModel is a must, as it compares your Pak files to the backup you're using.

How do I do the comparison you may ask?

Launch your FModel and go to the Loading Mode, from there select either All (New) or All (Modified) and hit Load, then a window should pop up asking for the backup file. Select the most recent one.

As of making this I have PD3's 1.1.2 version installed so I simply choose 1.1.1 Patch file and proceed to see what's being changed or added with the 1.1.2 update.