"worth it" hmmm.. I'd have to say no.
Yes it makes it faster.. but there is a REALLY high chance you'll kill your ibook. Unless you've seen resisters as small as these before let me tell you there freeken small.
I had a pro at work with #0 soldering irons and an eye glass do the reisistor moving for me.
If I where faced with doing it again there's no question I'd sell it on ebay and take the money and get a new one!
Don't do it.. sell yours and buy another, it's just not worth it!