👍This is exactly my impression. The Wordbuilder is a bit easier to use than the East-West-SC-Woordbuilder but the results still not as real as other sampled instruments can sound today. But even the very versatile last EastWestSC-Wordbuilder (which was horrible unstable for large text when I tried it) was not that breathtaking understandable.
In short, It is very difficult to become singing real language (however even "real" Singers and Choirs are often not realy understanable) , but in a musical view it is a very big difference to have the different Vowels of the text instead of only one or two very similar which makes a static impression which reduce realism very much, since what you hear while any note is held is primarily the Vowel, they determine the Colour.
Imho, Virharmonic is not bad and their wordbuilder might be not always that satisfiyng but is still one of the best available. VSL has started their Choir with high musical ambitions and for sure will be the musically most satisfying as soon the vowels are complete.
@ one thing is good to know about the Czech-Boys.
the Intonation of this boychoir is explicitly meant as "realisitic" instead of "clean". Yes the amount of wrong intonation is "realistic" for a boy choir but very good boychoirs are still able to sing more clean. (That's why I fear producing good realistic clean boychoirs, might easily become be a torture either for the boys, or for those who record or both)