Considering Im totally new to rooting and what not I don't really know.
With that said PLZ do NOT install this new ICS leak for the Razr/Maxx. Last hting you want on a new device jus tgetting into thigns is finding out you took it off path and with no way to return to stock at this point.
I am curious tho on your comments of the update failing on you. And mind you that is a good thing IMO at this point. Anywhoo what software build is on your device now when trying to update and it fails. BTW rooting has nothing to do with whether or not it will pass or fail and install