I guess mileage must vary, because I've had great success with this. So much so I bought it after my 10 day trial was up. Here are some of the things I did.
1. Remove time stamps and text.
2. Remove blotchy artifacts that are byproducts of poster edges and other photoart techniques.
It was number two above that compelled me to buy, because it solved a problem that I've only been able to fix with tedious hand retouching.
I noticed some complaints here about the speed, so I just timed a test. The test was an old 640 by 480 image with some text in several spots and a border around it. I had Retoucher remove the text and extend the image into the border. Retoucher took 38 seconds in Photoshop CS on a 2.4GHz P4 with 1G of RAM. I don't think this is unreasonably slow.
BTW, one thing I do is make very careful selections, with maybe only 1 pixel extra around the object, if that much. But, then again, I'm not working on scratches. I'm working on things that are easy to select with the magic wand or color select.