I saw this review last night. I had never seen a review by James before on any instrument. My thought is that the black keys are shorter and would therefore require less weight than the white keys which are longer. I don't know if the weight of the black and white keys is identical on a grand piano. When I took lessons I played a German M Schulz upright at home and a Chickering grand that my piano teacher had. I remember the Chickering had hard stiff action compared to the M Schulz. It never occurred to me that there could be a weight difference between the black or white keys. As I remember the black keys always seemed easier to push down and I always thought that was because they were shorter.
