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Shall I root or not?

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http://androidforums.com – OK, I finally took the plunge and installed ICS but have a question or two. I want to install Titanium Backup but see that it can only be installed on a rooted phone. I'm willing to root my Note but understand that by rooting I will limit my upgrading of ICS. Is this right? On checking my settings I see that I have Android 4.0.3 installed and have seen mention of Android 4.0.4 being available. Is it worth updating to each new revision as it comes out or should I just be happy with what I've got and wait until something major comes along. Is it easier to go from 4.0.3 to higher versions o (General)