Black Grand was tested in an article in Keyboard Player Magazine, issue 291. It wasn't a review with stars and such, just an article.
Here's a small exerpt:
I thought the best thing to do would be to leave these controls well alone at first and get a good impression of what the Black Grand's piano sound is like 'in the raw', so to speak. A good impression? That's an understatement. This is a grand piano that, in its various guises, is perfectly capable of handling anything you throw at it, and the quality just oozes out of every sound that you try. I don't think anyone could say that there's a bad sound here.