I would disagree with some other's low estimate of the Roland's. As I said, everyone has different priorities. I am extremely happy with the realism of my Roland G70. It's piano is without par (which isn't JUST my opinion, Ian

), it's drums are perhaps only a hair behind Ketron, and it doesn't need audio loops (which are far less customizable or available in a wide variety of styles) to achieve it. It's B3 sim is up there with some dedicated B3 clones, strings and brass are excellent, synth sounds are gorgeous, saxes are as good as anything with perhaps the exception of Yamaha's SA voices.
In fact, my only opinion of a weak spot would be it's guitars, which are still good for an arranger, but not as realistic (in style parts) as the Mega Voices of Yamaha or Korg's Guitar Mode. But I generally play with a guitarist, so that point for me is moot.
But I play in real full bands a lot of the time (still on my G70) and it's sounds keep those guys as happy as my K2500 or Triton ever did. If you want to know if an arranger sounds live, I say play it IN a live band!
My entire decision about whether to buy an arranger is based on whether I can get the same feeling playing with it that I do with a live rhythm section. I need the drums to be dynamic, crisp and punchy. I'm not looking for a polished 'studio' sound. I want SLAM! The drums in the Roland's come almost in their entirety (save some legacy kits and electronica sounds) from their TD series drum modules designed by and FOR real drummers. That, for me, is a VERY telling point.
For this liveness, I am prepared to give up some of the more sophisticated features on other arrangers. If it doesn't convince me that I've got a real drummer, what point is all the bells and whistles?

So, anyway, before you take anyone else's opinion to heart too much (which I completely counsel against), allow me to present a different opinion about Roland's. I think they sound VERY live, in all but the guitar department, and that is still not bad at all...
I still believe, instead of asking opinion, you should listen to every demo, factory AND user, that you can get your hands on. And decide for YOURSELF whether any of the top arrangers are what you want.
After all, it is YOU and not them that is going to have to play it...
