I just downloaded the Maestro concert grand last week and it works fine in Kontakt. It did ask if i wanted to resave some voletile samples ? which i did ( just so it would stop asking me :) ) but it all seems to be working OK. I must stress though i am not a pianist and im just using MCG as a suport piano in some backing tracks ( which sound fine to me ) so i'm unsure how a pianist would rate the MCG samples. Cheers