Oh this is so painful!
I watched the modified-for-US-audience version of this film back around 1965 in the Arcadia Theater, Kerrville Texas. I was just shy of puberty.
This film was refreshingly different from what was served up as Science Fiction film up to that point. It had characters and interpersonal dynamics that seemed , and the plot line was centered on those dynamics rather than some trumped up alien threat. The film was plainly sliced up prior to release in the USA, and of course it was dubbed.
I have always wanted to see XB-1 in its original form, in its original language, even though that language was Czech, and I do not speak Czech. But along came this DVD, and it promised that this was the real deal, the original un-compromised prime example of Eastern European, Iron Curtain era science fiction.
Alas, just because it is a DVD, and just because this is the 21st Century, and just because all kinds of media are interchanged internationally, this recording is only in Czech. There is no selection menu allowing for language subtitles. It is in Czech. Only in Czech.
If you are fluent in Czech, by all means, buy this DVD.