I also have a QS7 and agree with Mister Music. The sounds are decent (with a little tweaking here and there, they get better). Effects are good. Interface can be a little tough till you get used to it. I got mine primarily as a controller with the onboard sounds a nice bonus. I use the sounds to "flesh out" sequences. Also, you can obtain Qcards with preprogrammed samples that are pretty good. If you want, you can also use sound bridge software to burn your own samples onto ram cards. For the price, I don't know of many keyboards that are as versatile. Good luck.
Mike