It's the question how much Koczalski's soft style will attract your attention. It has some weak points, for instance left hand playing could be criticized.
But he was admired during his carrer, before II W.W. And his interpretations of ballades are great in my opinion.
They are flowing all the time, moving forward with tension hidden under poetic melody. Effect: fourth Chopin's ballade lasts 8:14! I heard the opinion it's reduced here to another waltz, I strongly disagree. In my opinion he exhibits here very well the modifications of the main theme and play it better then it is usually played.
Polonaise is worse for me.
This recording will give you bigger scope of how can Chopin be played, but don't buy it as a patch for hole in your Chopin collection."