I agree... It's very involving. There are some great bits of dialogue in there, such as when one of the invaders is badly wounded, and I think his buddy says, "He's fucked." Also, one of the invaders continually calls the protagonist "Almost” because he failed to evade capture. Awhile back, according to IMDb, someone used to call Mel "Almost" and he hated it.

One of the last few shots in the film is just brilliant... I won't venture to spoil it, as I disagree that a film that's not a week or 2 old can't be spoiled.