One of the greatest benefits of root is to install the custom recovery (ClockworkMod) and make regular backups of the gTab.
I try to make a backup once a week or so... so if we download a malicious app or something otherwise screws the tablet up, all I have to do is go into recovery, wipe data/factory reset, and do a restore of the last backup. It'll be like nothing happened!*
LESSON LEARNED: I back up my 3 Droids religiously every week, but have neglected the gTab because we only use it for a few apps and do little else with it. Then over the weekend it decided to totally muck up: every app force-closed, couldn't do anything. Without a recent backup, I had to wipe and start all over. Now I will make SURE to backup the gTab every week, when the phones are due.
ANY Android device I buy - especially my next Android phone - MUST be rootable if for that reason alone. Backups are indispensable!
*- ROM Manager is not good for making backups for the gTab, at least not for me. You're better off to go into recovery and backup from there. Just something to keep in mind after you root.