FILM FAX ran a buncha stuff on this a couple years back, detailing the making of it, interviews with the lead actress, etc. It's unavailable on dvd far's I know, except blackmarket (and I haven't seen any of those).

I find Oboler's stuff onderous, radio as well as film. I'd been willing to give him the benefit of the doubt until actually hearing some of the old Lights Out radio programs (which were before my time). Stinky. FIVE does get points for being the first, and the frame grabs I've seen are pretty desolate and eerie.