I have tried out the JV/XP series sounds (mostly in the XP 30) and I am not entirely thrilled with the organs. I presently have a Korg N5, and while I prefer the Roland sounds I've heard over the N5, I still like the Korg's Hammond sounds a lot better. I think it has partly to do with the rotary speaker effect, which doesn't seem to sound as good on the Roland. Everything else on the Roland I really like and I hope to get an Orchestral board if I do buy a JV1010. However, can the preset organs be tweaked to sound better?
I specifically think that it has to do with the rotary speaker effect, and perhaps control over distortion, but I'm not sure.