What are the advantages and disadvantages of updating from XP SP2 to XP SP3?

Are there any disadvantages of updating from XP SP2 to XP SP3?

Will I have any choice if I have Automatic Updates turned on?
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Automatic updates will automatically push it out if enabled.

It rolls up all the little security etc updates since SP2 so it will be more secure, I've found it a bit faster to bootup as well, I've calculated a 15% difference.

Main new features are
  • Network Access Protection compatibility. Announced years ago, this feature allows Windows XP machines to interact with the NAP feature in Windows Server 2008. This functionality is built into the RTM version of Windows Vista as well.            
  • Product Key-less install option. As with Windows Vista, new XP with SP3 installs can proceed without entering a product key during Setup.            
  • Kernel Mode Cryptographics Module. A new kernel module that "encapsulates several different cryptographic algorithms," according to Microsoft.              
  • "Black hole" router detection algorithm. XP gains the ability to ignore network routers that incorrectly drop certain kinds of network packets. This, too, is a feature of Windows Vista.
Ref: http://www.winsupersite.com/faq/xp_sp3.asp

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I've not really noticed any real differences with installing SP3. One downside I did noticed was my Address Bar on the task menu (below the Start Menu and Quick Launch) was removed.
It was apparently removed for legal reasons.

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Windows XP

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