As some might have notices, I still own the BK-9, too. I sold my BK-7m. I will think about selling again in case the SD40 is available, makes a reliable impression and isn't 700 euros more expensive than what I paid for the BK-9.

A performance includes various settings, not only a style, but also settings about the upper/lower parts/sounds, effects, style parts etc. Midi settings are stored in midi sets outside of the performance, but a performance can be linked to a certain midi set.

As I'm no fan of the click&press wheel, I recommend using the two iPad apps available for the BK-9, performance editor and BK partner.

Regarding the remark about the G70: regarding sounds and styles, BK-9 has everything the G70 had, and much better sounds in addition, with the exception of the lack of an SRX slot. The G70 had advantages in terms of operation and number of live parts.