The 5000 was a phenomenal keyboard, had very great wide sound. The 6000 was a step back in terms of speakers i would say, and indeed... Don't get me started on the keybed of the 7000, i thought it played "okay" but it wasn't better than keyboards 1/10th the price..
Unfortunately, as i'm writing this, the keybed of my 920 is handicapped.. This happened 5 minutes ago..
https://www.youtube.com/watch?v=Q3StEHPBP-U&feature=youtu.be