The sound is good right away in my opinion, after a few hours the strings will loose the "brand-new-string-brilliance" which is to be expected.
The problem for me is that they only last for about 4-6 weeks, I am a music student and play 3+ hours a day but I think the should last a bit longer.
They become doll and dead sounding, I play a 5 string with high C so i need the clarity, not the string for me.
Overall though, great sound! balanced sound with good punch and wormth, responds well to different playing styles/techniques.