Well if you want to get an idea of the build quality look towards owners who have the S-500. They'll be able to at least give a general idea of how well they're built.
I think the new design is interesting, but geeez oh man Yamaha. How much longer do buyers have to put up with those shitty pitch bend and mod wheels???? Even the new MM6 synth/arranger (which at the core is a PSR), has good pitch and mod wheels.
Based on the looks at the moment my only gripe is with the wheels.
Squeak
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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.