First off, movie wise, this is far from the best Bela Lugosi you're going to see. It's goofy, cheap and corny, but a heck of a lot of fun. So if you're a genre fan, and you missed it previously, you should get a kick out of it. The giant bat, screaming through the skies is pretty darn charming and hard to resist.
Seeing as it was a cheap film from the get go, this bluray is remakable. The film has never looked, and most likely will never look, better. The transfer is taken from some prints that are in amazingly good shape, and any print damage is very minimal with age related problems being handled with care. It always looks like film, never digitally washed of all character, which is exactly how it should be.
A top rate effort and a damned pleasing disc. A goofy Lugosi programmer gets the care of a film 100x it's stature, and that's why you should buy it.