I don't have RSI, so the staggered layout is ok for now. I also use colemak rather than qwerty, so that also helps with excessive movements. The adjustable split is definitely better for my shoulders.
I had the Kinesis Advantage 360 on my radar, but the price was quite high (literally 5 times higher than what I paid for the Q11 where I live), otherwise I would probably have given it a try.