I had bought the Voices of the Apocalypse about a year ago and recently got their free utility for doing text. It seems to work and is pretty amazing. It is somewhat like the performance tool in that you use it along side Giga and type in the syllables you want, selecting from a list of all the vowels and consonants, and then load them. The notes then play with those syllables. It is not absolutely perfect words, like a live choir, but as far as I have experimented with it is an exciting development. It seems to me that it would be very good with Latin text, like Do-mi-ne, Ky-ri-e, etc. They also have a version of that tool that you pay for - more elaborate and maybe better though I haven't tried it.
As far as I know there is NOTHING else that does words other than a few set already-performed ones, like the Symphony of Voices, or the Miraslav with a few EE and OH and Ah vowels, etc. But the V.O.T.A. is the only complete all consonant, all vowels sampled choir in existence.
By the way, I do NOT agree with that trashing of Miraslav. Yeah, his stuff is expensive but was fantastic quality for the time it came out and still sounds damn good. The choir he did is more current in technology, and sounds quite impressive though it doesn't have all the syllabic voicing like the V.O.T.A.