I've picked up three of the single-disc releases so far - ZIMMER 13/ROOM 13, DAS INDISCHE TUCH/THE INDIAN SCARF and DIE TUR MIT 7 SCHLOSSERN/THE DOOR WITH SEVEN LOCKS, and have been very happy with the quality so far (the video image is often remarkably sharp and luminous, to borrow an over-used phrase)...although the English subtitles (or rather dubtitles, as has been pointed out already) are occasionally somewhat garbled, betraying signs of being phonetically transcribed and occasionally substituting nonsense homonyms for the correct words (e.g. "like?" instead of "light?" when offering somebody a cigarette). (The 7 SCHLOSSERN disc also leaves untranslated the final spooky line of dialogue, after Eddi Arent's "Ende" speech: "Hallo...hallo...vorsicht auf dem heimweg!", or, roughly, "Be careful on your way home...") In common with Medusa's BIRD WITH THE CRYSTAL PLUMAGE disc, the subs occasionally drift out-of-sync with the on-screen dialogue, too, but that's not such a big deal. The packaging on the individual discs is outstanding, wonderful colour reproductions of the original German poster art. The only extra on these single disc releases is a raft of trailers for non-related titles offered by the distributor - with the exception of DER WIXXER, a NAKED GUN-style parody of the Edgar Wallace franchise from last year which will prove to you that the Germans DO have a sense of humour...but not, perhaps, as we'd know it. :P
I'm waiting to see if their upcoming March releases of DER MONCH MIT DER PEITSCH and DER HUND VON BLACKWOOD CASTLE carry English subs...if so, they shall be mine, along with DER HEXER (which I've never seen).