dcs wordclock

I have heard dcs owners say the external clock is worth the investment. Can any one say why it works better? I'm talking about two components (delius and verdi), not three. I could understand a clock for three components, but how can two components connected at the clock be bettered ? Has anyone tried the esoteric clock with the wordclock connection? Does the wordclock connection work differently than the other one (whatever that is). Thanks