In my opinion, the quality of the piano sounds in most arrangers is adequate (and is even complimentary to) the rest of the soundset that makes up the average arrangement (unless the piano is the featured solo voice in a piano-oriented arrangement). If you're that great a pianist and demand better, get a digital piano or a great 88 controller and the best sample library you can afford. I love 'Rhodes' and bought a SEVEN; I love it more each day. JMO.

chas