I think the PA2X is definitely worth the extra cost over a PA800. While they do sound the same the extra keys, better keybed, real time sliders, XLR inputs, additional features, and the look itself are far more appealing than the PA800 to me. Of course YMMV but I'd pay the extra for the PA2X if I were in the market for an arranger. Now if only Korg would make an OASYS with the PA2X software added they'd really have something.