Hi again Chony
In addition to the above post, the most popular VST instruments that are loaded and played live by a lot of Wersi owners are

B4
FM8
Kontakt 2/3
Colossus
Real Guitar
Virtual Guitarist
EZ Drummer
Halion 3
The Grand 2
True Pianos

As you can see, playing live with VSTs is no problem if everything is integrated and designed to work together. (It just becomes another voice that can also be used in the styles if required)
So go on and give your VSTs another try. (You’ve paid for them so you may as well use them)
Hope this helps

Bill