I have his Forrest Kingdom II library. I got a deal on it a few years ago. Great sounds. I find it useful from time to time ( it would be even more usefuf if I was any good on keys... need to try it with Midi Guitar).
The only issue I can see is it uses the Engine interface which gives you a limited number of authorizations. So far I have had to re-authorize every time Windows 10 updates. I will soon have to contact Best Service to see how they will handle this. I doubt it will be a problem.
Overall all of the Eduardo Tarilonte libraries sound good to me. I also would like one of his vocal libraries and would not hesitate to buy.
Dan