Awesome Music: "Not in Love" definitely counts. Robert Smith of The Cure on vocals, Alice Glass' breathy ones joining in at the bridge, and Ethan Kath's newly polished production skills really make it for this one.
"Alice Practice," the song that introduced them to the world. Basically what would happen if you captured a chiptune band and a female fronted hardcore punk band and made them fight. It's glorious.
Broken Base: Post-Alice departure, some fans are divided on who to side with regarding quarrels between Ethan and Alice. Alice has claimed that Ethan stifled her creative input, while also saying she's the one who wrote most of the lyrics for the group's songs, while Ethan has maintained that he's the one who has had most of the creative control, even prior to Alice joining him to form Crystal Castles (and has kinda passive-aggressively mentioned how some of CC's more popular songs did not even feature Alice's vocal work).
The fans are also divided as to who they favour as the vocalist, Alice or Edith.
Once again, "I Am Made of Chalk." It's probably one of the weirdest songs they've put out, consisting almost entirely of modulated wailing and screaming. The amount of speculation as to just what the song means makes it reach levels of Mind Screw equal to the work of Swans.
This image◊ of the two wearing weird black things on their heads and staring at you.
The official music video for "Magic Spells". It's under a minute long and revolves around a person resting in a sleeping bag inside a cabin while a man is outside in the background. The man then enters the cabin and nonchalantly drops a cinder block on the sleeping person's head.
"Tell Me What to Swallow", a harrowing acoustic ballad with lyrics from the perspective of a victim in an abusive relationship choosing to stay. Alice's agonizing vocal delivery makes the song even harder to stomach.
"Child I Will Hurt You" qualifies as well, a rather soft song that sounds almost like a lullaby.
Hearing the news that Alice was leaving the group was undoubtedly this for many, with some even going as far as proclaiming that her departure spelled the end of CC, but her allegations of Ethan sexually, emotionally, and psychologically abusing her imply that—at the very least—the two's separation was not amicable.