So much fun... such a huge sound (for the size)... Simply a little beautiful machine. It's a bit overpriced but compared with the mk I, it comes with a whole lot of improvements, not only because of the (at least) usable keyboard and limited but very practical sequencer, but because of the extended range of oscillators, effects, connectivity and so on.
It's very easy to build but requires some patience with the super tiny screws and screwdriver. The quality control could be improved nonetheless (everything works fine, but for the price I would expect a bit better finished pieces, not dirty ones or with rests of glue...), and the overall feeling is that it could break if you put it in a backpack. So you better give it some love and care :)
There are still some bugs, although nothing very worrying. I assume they will be easy to fix and Korg will do that in a future update. But all in all, it sounds GREAT and will make you happy time and time again....