I have version 5 I think, and the one thing where power desk pro excels is the built in file viewer.
I am used to windows commander yet when I am trying to organise/clean, i find the instant file viewer pane in power desk to speed things considerably - it also previews more formats (at least the pro version does) and you can quickly see inside pdf, office documents etc. without starting anything. I think it might use the engine from quickview or whatever that tool was called.
For example I had an attachment directory for poco mail which had thousands of files, from attached emails (text) to images to pdfs and all sorts of files. I managed to trawl through with powerdesk and delete most but keep the useful one, it would have taken forever had i had to open each file in an image viewer, text editor etc.
The other file management features are fine, although i didnt remember it does context menu extensions. It could be new or it could be that i already have stardock and wirekeys modifying this and powerdesk's changes were kind of unnoticed.