This was an excellent Twilight Zone. Cedric Hardwicke was brilliantly rude and mean as Uncle Simon. The direction by Don Siegel - of Dirty Harry fame - was first-rate and creative. The story and dialogue were also extremely sharp. As was often the case with the Twilight Zone, the script was of more movie quality than TV quality.
I'm not sure what the 7.1 rating is all about: it's way too low. The overall score for The Twilight Zone is 9.6, but the individual episodes rarely even get an 8.0. This makes no sense and shows that the raters aren't very good at this kind of thing. Come on people, if you're going to rate these shows make sure you know what you're doing!