It's a great idea. Nice little program. Requires a good amount of people to purchase it to make it really worth while as it relies on other people running the program so you can get stumbles in return. Then in the panel on it says v4 was just released but it didn't work.
Lacking in features like adding multiple links, ability to delete links in the list you don't want to stumble like porn sites or Viagra. Could see it turning into a real spam creator.
One would think the purchase option would in fact be disabled tell the script was working again. As I don't see any news about stumble having updated the script lately.
Will keep my eyes on it to see if later on the issue is fixed and its working.