My wife and I love redbox. It provides a nice, convenient, way to pick up current movies.
As a mechanical engineer, I'm fascinated by the rental machine from the robotic delivery system to the wireless inventory management. A couple of design features could use additional thought.
The first is the display. Great indoors but outside - almost unreadable. redbox has added a sunshade but I don't know if it's to protect the display from the sun or to be used as one of those old time photographer hoods. My wife and I use it as a hood.
Second item concerns returns. Ever get stuck behind someone who is browsing when all that you want to do is return your disc? Why not let the side slot multitask and accept your return while the other person browses?