You can customize it in many different ways by changing visualizations, modifying the playback options - you have a wide range of tools to change picture properties, add filters or make video captures - or adding and removing the plug-ins that you desire and when you desire.
But what makes KM Player that comfortable is the "Open Album Art" feature that is in fact a preview of video thumbnails, which rends video managing easier. Users can jump from a thumbnail to another in order to pick which video to play. Besides, this feature transforms a simple media player interface into a really practical and minimalistic looking one.
So, as I was saying, customize KM Player as you please, make yourself comfortable and enjoy your movie.