I actually would be more upset/worried if LA got Williams in the deal.
With Smith, if the C's match up with them, either Smith doesn't play or, if he does, GOOD, it means Bynum is still hurt and Smith does not scare me at all.
However, Williams is talented, and I could easily see him as being a bigger, better version of what Shannon Brown (throw in into the Vlad Rad/Morrison trade, emerges as quite productive) has become.