First of all, this is not samples of a Steinway but a Kawai EX, preferred among many professional pianists. This is probably the best sounding computer based solution so far but in need of some improvements.
Pros: - Natural piano sound - No loops - String resonance - Realistic pedal down effects - Ability to change the velocity curve
Cons: - Bug 1: It takes too long to export audio in Cubase - Bug 2: Activating both Hammer Action and String Resonance results in minor clicks when releasing keys - Bug 3: Presets cannot be saved - Still in need of improvement regarding the sympathetic resonance - Requires lots of memory to make use of the full potential, 512 MB absolute minimum