Reichu: This song is so much fun! It's ominous in a really cheesy way, and it's catchy enough that one (okay... I) can't help but sing along like a complete idiot. Incidentally, ANGEL ATTACK is also the second most overused BGM in the entire show, used a grand total of 13 times.
Kendrix: After a few episodes, you could tell that, when you hear this music, Murphy's law will strike - It spoils quite some sudden dangers. Or maybe it's like the spoiling previews/supposed to freak us out/create tension in advance.