Mike,
The Motif XS is a full synth/workstation. It's not a dedicated arranger, but with this newer feature it's bringing some arranger abilities to the synth world. It's just a start I guess, but a good one at that.
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.