Some of the posters here are being ridiculous with their grievances concerning a lousy 3 keys..WHY?
Why is it so incomprehensible to some folk that Korg chose to go with 73?With 73 keys,you still get an entire octave & for people with space constraints in their studios,it's a really nice option.
For those who play live,if those extra 3 keys are so critical to have,then just go with the 88-key.

If the cost of an 88 keybed is the real issue,then those individuals might want to consider a midi controller keyboard,as there are more options to chose from.