Never buy a DVD without knowing for sure that it is alright. Usually, I search the web for informations before buying any DVD - and when I bought the british DVD of Paul Verhoevens notorious "Showgirls" (second hand) I was was harshly punished for being careless. It was cut! 
Fortunately, I managed to return it and change it by Antonia Bird's "Ravenous".
Further purchases (All second hand):

A Sam Fuller Double Feature including "Shock Corridor" (1963) and "The naked Kiss" (1964) from the UK by Metrodome,
Jess Franco's "Eugenie de Sade" (1970) by Wild East Entertainment (I already regret it - the english dub is awful) and the first german film to deal with homosexuality (even in a positive way!), Richard Oswalds long lost silent "Anders als die Anderen / Different from the others" (1919) by Kino Video (Do they always replace original, non-english captions by new, cheap and english ones?!).