I have Synthogy Ivory II Grand Pianos. I did a lot of research before making the decision.

It contains a number of variations of Bosendorfer, German D and C7 - I mainly use C7

Pianoteq was in the list for sure, but Ivory won for me. The library takes about 80Gb of disk space.

(And, yes, I bought it from Sweetwater in the States - telephone order.)

Incidentally, I've also got a Yamaha Conservatorium Grand Piano. Even with this to compare to, Ivory takes a lot of beating. It really is sampled extremely well.

BIAB & RB2025 Win.(Audiophile), Sonar Platinum, Cakewalk by Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Kontakt, Focusrite 18i20, KetronSD2, NS40M Monitors, Pioneer Active Monitors, AKG K271 Studio H'phones