I had a look at the user manual http://www.soundsonline.com/symphonic-choirs. It requires PLAY 6 installed (WordBuilder runs inside PLAY 6, p30). It will take hours to get familiar with building the words. Not to mention starting using it.
Listening to the samples on their website, I can't hear the lyrics clearly. It is more like mumbling.
A competing product is Requiem Choir from 8Dio, which is $498, and it requires Komtakt 5.8 or later.