I had to balance this up after its sole one-star review here.
This is another bargain trio of vintage horror-ish films, and as such does what it says on the tin.
THE DEVIL BAT  is the best, with Bela Lugosi training a huge bat to attack his enemies.
VAMPIRE BAT,  with Lionel Atwill and Fay Wray, is a thirties Gothic with vampires, incensed villagers, fiendish experiments et al, and is a fun hour.
CREATURE FROM THE HAUNTED SEA  is a cult Roger Corman film, about treasure hunters and Carribean revolutionaries. It's quirky, but a little boring; if you can't sit through it all, just watch the animated title credits and the last ten minutes with the furry ping-pong-ball-eyed fuzzy monster [that would have been good on Sesame Street]. This is the most modern film on the disc, and the weakest.
Generally, if you like this sort of thing, you'll be entertained, and the two Bat films are pretty good. Expect no extras, but get the disc very cheaply for a little bargain.