Thanks.
When I bought the BK-7m in 2011, I found generally it had a better sound range than the Fantom X derivates SonicCell and Juno Stage except for the strings and lacking expandibility with SRX boards. I also rated it slightly better than the Yamaha MoX I bought later (MoXF is much better though).
Now, as I own the MoXF AND the Integra, neither BK-7m nor BK-9 can create any excitement about the sounds, but still the BK-9 could be a very practical instrument with many reasonably good and a few very good sounds conveniently accessible together with styles (when I need them). I also like the chord sequencer feature to use the left hand for other things like manual bass.
Price at Thomann is still only 1,298 euros, probably not much time left for decision, then the last BK-9s might be gone. On the other hand I never wanted two full-size keyboards, and I'm not going to get rid of the MoXF.