I too had the S970 and loved it! Have to say the upgrade was worth it to me. To me, the drums sound more "live" and the sounds are super. Though I have yet to begin exploiting the Assignable buttons, I can clearly see the utility of them and will definitely be employing them to simplify use of the board. Speakers sound better too! Still a lot more for me to learn but I am a happy SX900 camper!
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Randy

PA4X, SX900 (Baby Genos), Roland U-20, L1 Compact, Way 2 Many Saxes

"My computer beats me routinely at chess - but it's NO MATCH for me at kick boxing!"