I just did a shoot out with Cakewalk's True Piano vrs East West's Steinway B from their Gold Complete Symphonic Orchestra program, and The Steinway and C7 from Ivory II. I used the same midi file for testing all the pianos. Here's my opinion...
True Pianos was a bit loud and harsh but still sounded okay for many uses.
East West's Steinway B sounded better, but Ivory's C7 was the big winner. It sounded warm but rich, a little bit quieter without so much noise that the other piano's had. It sounded like it was a very controlled sound, but in a good way. It sounded like it had better mics or quieter studio enviorment in it's recording process. The other piano's are very very usuable and not bad by any means, it really is a close call, but Ivory wins in my opinion. Is it worth the extra money ?? That's your call, but in my book, yes.