I agree with the speakers hiding your hands. It definitely would give a false image of live playing. If that's the only on-board speaker option, It would be difficult to switch from the 800 (for me).
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Yamaha 920 / Yamaha DGX-670 / Maui 5 Go (2) / Senn e935 / Sony C80 / Tascam DP24sd / ATEM Mini Pro switcher (studio)