Test drive ain't gonna cut it IMO especially to a newbie to the KORG OS like yourself,....yes you will get a "QUICK" feel for it BUT in no way should that be a judgement call,......
it takes days & dedicated hours to set it up "RIGHT" to get it right, and probably longer for a newbie between reading the manual and asking all sorts of questions of experienced users..but I repeat,... once the homework is done KORG arrangers are HARD TO BEAT! If someone is not ready to do that i say don't buy it and go with some out of the box pre default KB and be satisfied with what you get, but if you truly care about your sound, and musical playing experience to give your audiences a really enjoyable "LIVE" sounding arranger KB experience then it's KORG ALL THE WAY!