I agree with Elizabeth's comments. I've had my Tyros 3 for a year now and have received a lot (and I mean a lot of help) from friends on this site and members of the Yamaha Forum without whom, I would have sent it back to the shop within days of the purchase - and even after all this time, I am still struggling with the absolutely horrendous operating system. It has a digital sound system which in certain areas (i.e: pianos, strings, ballads) are better than the KN7, but if the KN7 is used with my Yamaha Stagepas 300 speaker system, there is very little difference between them.
Because of the complicated way in which styles, patterns and voices are saved, The Tyros 3 is VERY TIME CONSUMING and at times embarrassingly unreliable in loading songs etc. and this is why I still use my KN7 for gigs. It is quicker to name, save and load, Easier by far to operate, and is most definitely more reliable.
If I had to make a choice, the KN7 would win "hands down" as the saying goes.
[This message has been edited by Audrey Turner (edited 03-24-2010).]