Got the 4500 yesterday. At first it wouldn't work, the setup program kept giving me a message that it couldn't find it. So i pushed the reset button to restore factory settings and it found it right away.
Works good, i disabled the wireless feature since i don't use it.
In reality i spent 64.00 just to have the SB6120 modem link LED blinking blue instead of amber.
Oh well, i've done stupider things in my life. But am happy i did it.
Guess i'll move over to the 4500 forum from now on.
Thanks for all the feedback i've received here.