Tough to tell about whether it is a good price of not.. Those AUS prices all seem scary to us Yanks!

To be honest, the most popular SRX board at the Roland-arranger.com site seems to be the SRX-07 board. Adds in some great basses, some more keyboards, synths, organs, a whole grab bag of good stuff. A bit better bang for the buck (or Ozzybuck!) than SR-G01, from what most say.

I have no SRX installed yet - I'm saving it for the day I finally get bored with the ROM sounds! It will be cheaper than having to go out and buy a new arranger!
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An arranger is just a tool. What matters is what you build with it..!