I noticed your thread so I would like to inform you that we have added a short reviews/testimonials page from professionals (composers and producers) who use Hybrid Strings. We will add more soon.
Take a look if you have the time: Testimonials - Hybrid Strings
It's true that there are not many reviews around yet, because H.S. is quite a new library and a big percent of our customers are people from Arabic countries that do not attend the English-written boards (I guess)
Feel free to send us an email with any questions, we always answer within a few hours. Thanks for your interest on our work.