It solves an issue I always had with regular classical nylon strings, where the transition from the wound string to the unwound always sound uneven, changing the feel and the tonality.
With these strings, the dull sound of the unwound strings is not there, the strings have more attitude and definition, making the whole instrument more balanced. Would never go back! Just beware that the tension is a little higher that regular nylons, so choose a lower tension that you usually use for your guitar.