BTW, yes, Ian's point about the Roland ACC cutting off is only when you change chord recognition TYPES.
For me, it is a pain, as I tend to play two handed piano as the comp to a song, but want to go to LH chords, RH melody for solos, and the like. So the change is a little timing critical. But you CAN do it and get it close to unnoticeable. There's a workaround that makes the Pianostyle to LH ARR/RH solo mode seamless, but the trip back has a mute (drums and bass keep going, just the ACC will cut off ONLY the chord you play, it'll pick the next one up fine. So it isn't a deal breaker (if it were, I'd be playing something else!)...
You have to understand, I like to dig in extremely deep into an OS, I like flexibility in the OS, so any weird thing I feel like doing, I am not hampered by the OS. To this date, I've never found an arranger that gets it ALL right, but as part of my moderating the G70 site's bug forum, and from working with our New Features (wish-list) forum, I am one of the more vocal in trying to goad Roland into continuing with their already excellent upgrade path for this three year old arranger.
After two MAJOR and a couple of minor OS upgrades, the G70 is a far different, far more powerful arranger than it was when released (which T2 owners cannot say!). OTOH, it is not perfect, at least by my definition (although nothing else is either!), So my name gets attached to most of the gripes that are left. But I assure you, they are none of them deal-breakers (I'm still playing it happily!), and most can, like all the problems with Yamaha's (they exist) be comfortably worked around.
But there are NO perfect arrangers. Every last one of them forces you to adopt at least a FEW restrictions on what and how you can do things. For all the many things I admire in the Yamaha OS, I guarantee that if I had one, I could find AT LEAST as much to criticize in it's OS as I do for Roland. The only difference would be, that after I found them on the Yamaha, they would ALL remain unfixed until the next model comes out. Which after two major and two minor OS fixes on the G70, I cannot say...! Some still exist, sadly. But on the bright side, all of the REALLY major flaws have been corrected, so just because I continue to post about the remaining ones, don't for one minute think that I am a dissatisfied user!
Just hopeful (justifiably!).....
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An arranger is just a tool. What matters is what you build with it..!