Never saw this series before I watched the DVD set, I was mostly impressed by it, though it took a awhile to find its way. It started out with crime "thrillers", which ranged from moderately interesting to instantly forgettable, though when it showcased horror, it really hummed, with presentations like 'The Hungry Glass', 'The Grim Reaper', & 'Pigeons From Hell' being the standouts.
Boris Karloff presented all 67 episodes, and was as effective a host for this, as Rod Serling was for "The Twilight Zone". Karloff was in my view the greatest horror film actor who ever lived, and appeared in several episodes, the best of which was 'The Incredible Doktor Markensen'.
Not as moralizing as "The Twilight Zone", this series was noticeably grimmer in tone, though wonderfully filmed in Black & White.
If you can get past the crime episodes, this is well worth viewing.