I found the BK9 to be a great keyboard. It's just that some of the features I wanted weren't there and it was causing me to make some compromises in my setup. Still wish I could have kept it around too.
The other reason discussion has dropped off is that Diki is no longer here.
Again? That happens a lot over time.... Why he leave this time?
Luckily he is still discussing his BK9, i saw him posting the BK9 advantages on the Korg forums in a Post about Pa3x vs Yamaha..