A few thoughts: I first watched this one about 6-7 years ago and didn't like it. I probably just didn't appreciate practical effects as much back then as I do now because the past several times I've watch this I've been amazed at how well so many of these effects hold up. This movie is bloody, grotesque, and at times difficult to watch with how totally disgusting some of the body horror in it is, which makes me like it even more. Because I'm a sicko. You add in the creepiness of the set design, an eerie score, fantastic lighting, and the introduction of one of the greatest horror icons of all-time, and you've got yourself one fantastic horror movie. Easily among my favorites of the '80s, maybe even all-time. It has its flaws, but they're minor enough that I'm willing to overlook them due to the effectiveness of everything surrounding them. This movie is just really creepy and impressive to watch. And it apparently only cost roughly $1 million to make, which is ludicrously cheap all things considered.
Who would I recommend it to? No one who is at all squaeamish. But serious fans of horror and gory fantasy movies shouldn't pass it up.