Scott, I too feel that it doesn't sound all that bad. The drum and bass was really good to my amateur ears. I found another demo showcasing some balkan sounds .. I think :
Bk-5 demo
But one thing they should have added is a full blown sequencer; that would really distinguish it from the bk-7m feature wise. This will help in selling both the 7m and the 5 of course to different user segments. Bk 7m is a lot of value for money especially for those wanting to play right out of the box(quite literally without the need for sequencing.
Won't be surprised if a Bk-9 (76 key) totl comes up some time later this year.