I would agree with AJ's assessment. I own the Tyros and Motif ES. The only thing I would say is don't try to convince yourself that the arps are a substitute for the arranger function, they aren't. They are different in the entire concept. When you would get finished recording with the arps several times via overdubbing, it would sound like arps overdubbed, not an auto arrangement.
Terry

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jam on,
Terry http://imjazzed.homestead.com/Index.html