As a person who can't help being cheap, I do use all the fast food apps, and hate the dog-slowness of each one of them. It has been really interesting though, to see immediately when someone at McD or Wendy's HQ turns the discounting knob. McDonalds turned theirs down (for me?? who knows?) years ago, and Wendy's (sometime last year?) abruptly curtailed what used to be a really worthwhile regime (often giving any of a small burger, a drink, or fries for free with purchase) to one that usually just gives $1 off an item.