The beauty of staying with a certain brand is that you learn a common OS and when you do decide to upgrade to a newer model, there is a much smaller learning curve.

I would say I know my PSR-S900 arranger very well...mostly because it is part of my job to know it in depth, but also I enjoy digging in to explore it's vast capabilities.

Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.