Explained very well George..

Lukitoh,
I've played both the 300 and 500, and I have to agree with George.. Especially in regards to the 500.. That keyboard is really designed for home use and I don't think Yamaha had the performer in mind when making it.. However, like George said, they have great keyboard feel, but are based on the 350 technology...

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.