Save your money ...S900 its no big deal ....
a few Sa voices most nice for a novelty & must be played correctly to be effective but tire quickly ....how much acoustic guitar knocking & trumpet shakes can one stand to hear the sweet sounds on the 3k are more then satisfactory...vocalizer is useless...mic processor is usable though.
key-bed same light feel...rubber buttons take em or leave em....bare bones recorder is an added feature...poorly positioned ports and inputs in rear, no smart card...its does the job with many work arounds..but worth the upgrade?.. read above and decide if its worth it for you!