Hmmm, a few points to consider -
no vocal mic input;

no harmoniser;

no EC-5 pedal option (which is VITAL, in my view for smooth CS operation);

unbalanced outputs and inputs (could lead to noise issues when used with a P.A. system);

None of the great E.P.s, and only a couple of the basses and guitars from the PA3 (I am thinking this could be a greatly cut down ROM, and may even have sample artefacts and audible loop-points due to the small size);

No MAXX;

Not known for sure yet, but I also suspect it has the dodgy "plastic hinging" from the M50 and Krome keybeds. IE no springs or weights, but merely a folded plastic hinge to give the return...