I got this little baby to see if I could get away from the computer screen for a while. And boy, it does deliver!
It takes some time getting used to, which might also require some googling around. But once you get around that, it is a wonderful way of shaping ideas on a simple interface without distractions and endless choices. Sound is a little limited, but that's not the point here. Should you need to give a better "body" to your idea, use MIDI to drive external instruments (virtual or actual) and keep it as a sequencer.
Some silly missing details do exist, such as the lack of 'backspace' key when you rename a pattern. It was removed in a firmware upgrade and never made its way back. But these won't get in your way of being creative, just annoy you in rare occasions.
I do consider Korg's total disregard in correcting these details bad behavior though, which is why the 3 stars in features.
One last word of advice, pay really close attention on whether you need the synth or the sampler version.
Besides that, I would totally recommend this again and again and again!