Looking for feedback... Have you tried Redbox or Blockbuster boxes?

Every time I go to Publix or HT lately I am drawn more and more to the DVD 1 nite rental boxes from either Red Box or Blockbuster but some mysterious force keeps me from actually trying it out... and then I saw a story on TV about having to dispute charges, so I'm looking for feedback from you abut your experience with either product... do you like it?  have you had any problems? Do you often get codes for free or BOGO movies?  Are the discs in good shape?