I'm new and enthusiast. Yesterday I heard about this project and got my link. And started right away.
Still working a lot with old negatives and slides I often use the correction clone tools in PS. There are also correction tools of this kind here, but: the healing brush requires cloning from nearby, and the blemish removal makes things worse instead of better, it puts blemish extra in (in the pictures I used).
The PS quick retouch works with pixels from the surrounding part of the picture, so you sometimes can even "paint" away a scratch, with the tools provided here you need to re-locate step by step.
I'll see where it leads, it already looks very nice