Extremely difficult to learn, awkward to use. And is beyond the average arranger player tbh. It is even beyond most synth players too.
It has a very steep learning curve, and most folks do exactly as Nick did, buy it, try it, scratch their heads and then move on.
Invest your money in a MOXF for sure, because with the Flash Ram expansion it is quite an exceptional buy for the price, but unless you have weeks (even months) to dedicate to learning it (Karma), spend the extra money on 3rd party MOXF sound libraries.