I have all three of those Drive-In Discs and really like them, primarily for the fine PQ of the drive-in theater extras. I have been disappointed that they haven't come out with a Volume 4, 5, 6, etc. after a couple of years now. From the trailers on Volume 3, the next double bill was going to be The Blood Creature and The Creature From The Haunted Sea and they looked hilariously cheezy!
My only two quibbles are that, although the Popeye and Gumby cartoons were fine, the Betty Boop cartoons on the first two discs are not contemporary to the features, which were either 1958 or 1960 releases. Woody Woodpecker or Droopy Dogg cartoons in their place would have been terrific.
And the other quibble is that there really isn't an Intermission "Count Down" to speak of on any of the three volumes. Volume two has a cursory one with a 10 minute, 5 minute and 1 minute warning accompanying pics of flora and fauna, but the kind of drive-in intermission "countdown" I remember so well was the story countdown that showed a new chapter of a crudely animated short every minute until "Showtime".
That's where the "Hey Folks, It's Intermision Time!" DVDs come through but the PQ of their pieces doesn't come near that of the Drive-In Discs.