Re. the Roland product... I am afraid nowadays that Roland try to distance themselves SO FAR from actually using the word 'Arranger', it might be hard for any product rep to actually KNOW whether something about to come out is actually an arranger.

In their own product line up, GW-8 is described as a 'Synthesizer Workstation' and the Prelude is described as a 'Portable Keyboard'. At the US Roland site, at least the Prelude is in the Arranger section, but the GW-8 is in the Synth/Workstation section.

A rose by any other name... (wouldn't stink as bad!)

It's no wonder the reps are completely flummoxed about what any of the products that are coming out actually ARE...
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An arranger is just a tool. What matters is what you build with it..!