Congrats Julien on the new toy!
 
I have the it's big older brother the QS7.1 and use it in the same way as you do. I got mine about 13 yrs ago and I'm really happy with it (has some very useful internal synth sounds too). I only wish the keys were fully weighted, but even with my limited key banging, it's still in excellent condition.
 
 

 Congrats on the new toy.  
 
  

Thanks for the kudos... Rain, that you have one makes me feel better about it. I think it will be Saturday before I can get time to use it.
I fixed up a used Casio WK-1630 today with a new PS for my grandkids... that thing has some sweet organ sounds. The guitar sounds have major suckage but there are some nice sounds, the piano is OK too. They like it!
 
J