To return this thread to somewhere near where it came from...........
I think that many players don't make the distinction between PLAYING a real piano and HEARING it played. This is important, especially in the light of using an arranger keyboard and comparing built-in piano sounds.
There are many VERY subtle nuances in a piano's sound and touch that are rarely heard by anybody other than the pianist himself, especially in a combo situation, or anything other than rapt attention in a great concert hall. These minutiae often cause us to spend way more money than we need for a given function, and obsess over details that few, if any, of our audience can discern at all.
If money is no object (and someone else is humping these behemoths!) by all means, go for it! But be prepared to admit that most of your audience can't tell the difference..........
BTW........ Go to Roland's website and listen to demos of the SRX-11 Ultimate Piano expansion board
http://www.rolandus.com/products/details.asp?catid=13&subcatid=55&prodid=SRX%2D11
This can be added to the G70 (which already has a fine piano in it)......... I challenge anyone to find a better piano sound in a portable arranger!
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An arranger is just a tool. What matters is what you build with it..!