I think that the demo suffers for too much compression. Whether this was put on by the arranger itself (it has separate Mastering EQ and Comp for both the style section and the Keyboard Tones) or whether it was added afterwards to optimize it for web delivery, I don't know.

But I can assure you, take the compression off or reduce it radically, you are hard pressed to find a punchier, more live sounding arranger.