Not sure why my first review never got published...anyway, moving on...
If this album was released a few decades back, it would have been labeled "trip hop" and asked to open for Sneaker Pimps, Portishead, or Tricky. Although they would still make a great touring mate or featured vocal guest for those acts, so much has happened in music since then for Purity Ring to get inspired by, and yet their music harkens back to the creepy side of female new wave as well.
However, this is not an album designed to show range; Rather it's one built on a singular vision. It's not like Team Sleep either, where it's consistency is drawn from circling (or impersonating) a vague sub-genre. By comparison, Purity Ring make Team Sleep look like they are fishing for distinction. This is pure modern synth pop, but not the kind that is chasing behind a bandwagon.
The beats are a consistent blend of skittering trap music snares, wafting "witch house" atmospheres, and percussive bell tones that are distinct to this band (thanks to a custom MIDI sound/light controller they designed). Despite these comparisons, in no way do they bow to these trends, but at most maybe tip their hat to them.
The vocals have a ghost-like quality sort of like Grimes in that there is something cute (Pretty Girls Make Graves?) and angelic about them, but at the same time creepy and ghost-like (Portishead). This ghostly effect is really enhanced by the reoccurring anatomy theme in the lyrics. It's not just anatomy in a passive sense either, but each song seems to choose one body part (ribs, stomach, etc) and describe it in a manner as if it had a life of it's own and was advancing on the listener/antagonist or otherwise behaving unnaturally. Despite the fact that they seem to show even less range than Grimes, the voice and the drums take similar style hallmarks in a deeper, richer, and more engrossing direction. Grimes and Purity Ring both use vocal effects, but Grimes seems to rely mainly on reverb variations, natural voice modifications, and resampling, while Purity Ring is more into glitching, stuttering and placing the vocals upfront. The reverb soaking is more reserved for the melodic parts of the beats.
Grimes is more well known, so many people may find her first, then branch out to Purity Ring, but if you are ready to take this female fronted modern drum machine music to the next intensity level, try Light Asylum...they add a sharp dose of Annie Lennox and Grace Jones influence to this equation.