I had the previous two KN6000 one that I used for gigs and one at home. Both were equipped with hard disk from Switzerland. I updated the software all the time and had no major problems. I was also very well paid when I sold them.

KN7000 is obviously better in many small details. SD card is a great invention. There are a lot of little things that make it easier to program the KN7000. One thing I like is for example that you can turn off the speakers. Another is that you can download the lyrics of the sequencer.

On the other hand there is no difference in sound between the two and I mean line out.