Hi Taike,

I confirm what Henni says because I'm working with a Tyros 4 and an Audya5 with the AJ Update. After 3 years on stage it is still working well and I love this LIVE-sound, it's quite different to the Yamaha sound.
Don't expect, that Ketron changes anything or gives a support or service like other brands. In case of problems, I rely on the service of my dealer.
Now, take it as it is and if you are not impressed, sell it.
I enjoy, living with it.

Regards
Tom