I think it's as easy as other DAPs with Rockbox. I am not messing with the themes yet as I like the default theme blending in with DX50's overall design. Besides, I want to concentrate first on features affecting SQ.
As of the moment. DX50 feels like a new DAP to me. With the latest update all buttons are responding flawlessly with each press. No more annoying delays. Except for the Long press on the power button to shutdown the player, all button functions are spot on.
no delays on press buttons - sounds very nice)