You have to try it so see how useful it is when you re dealing with large images. Double clicking on the preview again collapses it. Here are some additional features I discovered while taking the program through its paces. Scratch removal is easy as can be. You only have to setup the spread amount and ,using a drawing tool, define the area that needs to be corrected.
Dust removal is also easy and uses a similar method.
Text applied to an image is still editable after you apply it. That is a very helpful feature. Borrowing from Painter s nozzles, Photopaint includes the ability to spray images in a random fashion with its image sprayer tool. It also includes some nice effects like a page curl effect. There is also an apply to duplicate button which is a handy way to experiment.