Some passages leave doubts as to what they are supposed to mean. It's not "badly written", but many times I have had the feeling of it being unnecessarily overcomplicated.
The above holds true for the manual as well. The handling of MIDI ports is rather unintuitive and sometimes needs to be reset, and the presets organisation could be a bit smoother in my opinion. Not that it doesn't work, but the interface isn't the most intuitive and visually convenient. Everything in it feels a bit old-fashioned, as if it was a piece of software coming from the early 2000s. Onboard programmability is a bit limited, but that's OK, the problem is rather the supplied software. The only slight downside to it is the programming side of things. The construction is nice, as to be expected by Roland, and it doesn't bend down when put over an X-stand and keys are pressed with force (yes, some keyboards in this price range definitely do this.). Aftertouch and mod/pitch stick are assignable too, and the keyboard sports a sustain pedal jack in and an expression pedal jack in, again both freely assignable. Total number of freely assignable controls is: 9 knobs, 9 sliders, 8 touch responsive buttons (even thoug they seem to have been omitted in the product description), and other 13 buttons (9 + 4). There are virtually no other MIDI controllers in this price range suitable to organ playing that I am aware of.
Its 9 sliders can be configured as drawbars, and you have a lot of buttons left to change percussion, chorus/vibrato and other typical organ parameters. Palm smears and glissando are feasible on these kind of keys with little resistance or without getting stuck. Even though it isn't technically a "waterfall"-type, the keybed is fairly suitable to organ playing, thus making the A800 Pro a good choice for using it as lower/upper manual of digital organs.