the harmoniser looks about the same as on the 6X00 as far as I can see.

the panel is quite solid, unless you actually jab at it hard. If you press any buttons normally it stays at whatever position you leave it in. The display is separately hinged around a central horizontal axis within the panel for sitting or standing angles, so the panel can rest in its full back position in all normal operating circumstances.

the sounds are superior due to either better speaker/amp system or resampling, it is difficult to say which reason for sure.

the apc to smf convert feature is the same as the 6X00. Not as easy as a system which actually uses midi format as its patterns, but quite possible nevertheless.

sd card saves in 5 seconds, loads in 1 second for a selective save, 2 seconds for a full performance save. Very similar to the sx6 hard drive, only without any spin up time delay. Custom save/load takes about 25 seconds because this writes to internal flash. Single custom load takes about 1 second. Turn off the "completed" message screen, since this takes longer than the actual load!