Well, if I get one, I can do the style assembly in my G70 and tweak it in the Prelude. I guess Roland make arrangers for the same people that Yamaha do... those that don't need EVERYTHING on the arranger.

Isn't it a shame that Jørgen and the rest HAVE to make computer software to do some things that Roland's do in the box?! This is a two way street you are driving down the wrong way, my friend

The Prelude OS2 (and GW-8 OS2) are the arrangers that the Prelude and GW-8 SHOULD have been in the first place. Difference is, of course, Roland don't make you sell your S900 to get the S910 so you can have the keyboard it was 'supposed' to be... They just upgrade it for free!
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An arranger is just a tool. What matters is what you build with it..!