I use it both for practice and live.
Pros:
Very easy to carry it from place to place.
It feels really good and steady construction (better than the B1).
The keys feeling is really good in my opinion.
The piano sounds are mostly good.
The included software.
Cons:
I think that Korg could easily put some extra sounds in the library. (not a problem for me)
It could be better if it has 2 inputs/outputs (left & right).
The missing split/dual mode may dissapoint some people but if you have no use for it, it isn't a problem.
Overall, it is more than good for its price, both piano and the electric sounds are good, although the electric sounds are simple but good, the keys also feels good and is easy to handle it.