By far one of the best choir libraries ever!
It feels so much better to be able to hear the choir sing words instead of just "Ah, Ooh, etc." even if it's in their own VOXOS language (which I jokingly call "Adiemus"). This results in a better approximation of your choir playback because words, even if it's pseudo words, add nuance to your mockup. This Latin-derived pseudo-language also adds a layer of mystery to the choir which I love. I'm a choir composer as much as I am orchestral, and this library is a must-have!
One thing to know when using this library they can't melisma a syllable (which is understandable since it's a limitation of the source library. It can only do one note per syllable basis). Although, you can still fake a melisma by using vowels to "extend" the syllable through many notes. The solo soprano, solo boy, and boy choir, though it does not have word options, sounds so lush and beautiful.
Also, did I mention this library comes with shouts, glissando shouts, and whispers? Now you know!
I cannot recommend enough this library. It's absolutely fantastic!