Oh, and don't forget to tell him... the same dearth of third party styles that puts off a lot of potential PA800/PA2Xpro users will apply to him, too. If he is content to stick with the ROM styles, or is one HELL of a 'tweaker' and style creator, the PA588 might be the right tool.
But especially for studio use, I would imagine that fresh styles, and LOTS of variety is going to be important. Maybe even more than live...
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An arranger is just a tool. What matters is what you build with it..!